Why we picked it: The Open University is one of the most-respected distance-learning universities in the world. Their free OpenLearn courses are the same quality as the paid degree courses. The right starting point if you want a UK education perspective on any subject.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE + CERT

Why we picked it: The only free source for college-level business courses with a recognized certificate. Saylor certs are accepted for college credit at 100+ accredited universities. The Intro to Business and Principles of Marketing courses are widely used for degree programs.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE + CERT

Why we picked it: The only free cert that hiring managers actually recognize in JS. The five algorithm projects at the end (Caesar cipher, cash register, telephone validator, etc.) are a real portfolio.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE + CERT

Why we picked it: Best free CompTIA Security+ and CySA+ prep. The courses are mapped to specific cert exams and many include a free certificate of completion. Some premium content is paid but the free tier is enough for the certs.

Subject: Cybersecurity · Format: Course · Cost: FREE + CERT

Why we picked it: SANS-quality content for free. SANS Institute is the most respected name in commercial cybersecurity training — this is the same material at the intro level. Good starting point before paying for SANS SEC401/504.

Subject: Cybersecurity · Format: Course · Cost: FREE + CERT

Why we picked it: The most-watched free AI course in the world — 1+ million learners across 170+ countries. The 'Introduction to AI' part has no math or coding, so it's the right starting point for non-technical people. The 'Building AI' part is a 30-hour Python intro for building simple AI systems.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE + CERT

Why we picked it: The largest free engineering curriculum in the world. IIT professors are some of the best lecturers on YouTube, and the courses cover everything from fluid mechanics to power electronics to structural analysis.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE + CERT

Why we picked it: The most comprehensive free soft skills training on the web. If you've ever needed to take 'How to Give a Presentation' or 'How to Manage Your Time' — Alison has a free course with a certificate, in 60-90 minutes.

Subject: Personal Development & Productivity · Format: Course · Cost: FREE + CERT

Why we picked it: The single most-used free-certification list on GitHub. If you want to earn a cloud cert (AWS Cloud Practitioner, Azure Fundamentals, Google Cloud Digital Leader) for free, this is the starting point. Updated monthly as new free certs come out.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE + CERT

Why we picked it: The only free source for college-credit psychology and sociology courses. Saylor's Intro to Psychology and Intro to Sociology are widely accepted as credit-bearing by US universities. If you want a free, college-credited introduction to any of these fields, Saylor is the right starting point.

Subject: Personal Development & Productivity · Format: Course · Cost: FREE + CERT

Why we picked it: The only free physics/math curriculum that uses a real CAS (Mathematica) for homework. Wolfram's Physics by Inquiry and Intro to Differential Equations courses are graduate-level-quality. Free certs on completion. The certifications page is the most polished way to show skill.

Subject: Personal Development & Productivity · Format: Course · Cost: FREE + CERT

Why we picked it: The only free physics curriculum that uses a real CAS (Mathematica) for homework. Wolfram's 'Physics by Inquiry' and 'Intro to Differential Equations' courses are graduate-level-quality. Free certs on completion.

Subject: Physics & Astronomy · Format: Course · Cost: FREE + CERT

Why we picked it: The only free site with both a vocational trade focus AND a free digital certificate. The plumbing, electrical, and HVAC courses are taught by working tradespeople. The free certs are accepted by many employers in the trades.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE + CERT

Why we picked it: The only free site with both a vocational trade focus AND a free digital certificate. The plumbing, electrical, and HVAC courses are taught by working tradespeople. The free certs are accepted by many employers in the trades.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE + CERT

Why we picked it: The only free OSHA-authorized safety training that comes with a recognized certificate. If you work in construction, manufacturing, or any trade, the OSHA 10/30 cert is often required for jobs — and you can do it for free through the Outreach Training Program.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE + CERT

Why we picked it: The only OSHA-authorized free safety cert recognized by every US construction and manufacturing employer. The OSHA 10-hour card (general industry or construction) is required for most entry-level jobs in those fields. 100% free through authorized outreach trainers.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE + CERT

Why we picked it: The intermediate freeCodeCamp cert — between Responsive Web Design and the JS certs. The 5 projects are the kind of front-end interview questions you actually get (the Pomodoro clock is a classic).

Subject: Web Development & Design · Format: Interactive · Cost: FREE + CERT

Why we picked it: The first freeCodeCamp cert every web developer earns. The 5 projects at the end ARE your portfolio. Hiring managers recognize the cert. Use it as the entry point to the JavaScript certs.

Subject: Web Development & Design · Format: Interactive · Cost: FREE + CERT

Why we picked it: The most fun way to learn music composition. Open the site, click on a square, hear a note. By the time you've spent 30 minutes exploring, you'll understand melody, harmony, and rhythm better than a textbook could teach.

Subject: Art, Music & Creative Practice · Format: Interactive · Cost: FREE

Why we picked it: The only free music theory course worth completing. DaveConservatoire covers the same material as a $1,000 Berklee semester, but in 50 short videos. Use it to prep for AP Music Theory.

Subject: Art, Music & Creative Practice · Format: Video · Cost: FREE

Why we picked it: The right quick-reference for common UI mistakes. Each article has a specific problem and a specific solution. Use it as a check-list when reviewing any UI before launch.

Subject: Art, Music & Creative Practice · Format: Textbook · Cost: FREE

Why we picked it: The best free guitar curriculum online. Justin is a real guitar teacher (not an algorithm), and the grade system (Beginner I, Beginner II, Intermediate, etc.) gives you a clear path. The 'Good Times' and 'Fingerstyle' lessons are classics.

Subject: Art, Music & Creative Practice · Format: Video · Cost: FREE

Why we picked it: The most comprehensive free art history curriculum online. The videos are short, the images are high-res, and the timeline navigation makes it easy to jump to any period. Used in actual AP Art History classes.

Subject: Art, Music & Creative Practice · Format: Video · Cost: FREE

Why we picked it: The most comprehensive free art history curriculum online. The videos are short, the images are high-res, and the timeline navigation makes it easy to jump to any period. Used in actual AP Art History classes.

Subject: Art, Music & Creative Practice · Format: Video · Cost: FREE

Why we picked it: The intro music theory course MIT students actually take. Professor Burt's writing-style of analysis and the MIT 'three-voice counterpoint' tradition are uniquely accessible.

Subject: Art, Music & Creative Practice · Format: Course · Cost: FREE

Why we picked it: A real college art appreciation textbook, free. The high-res images are usable in your own work (under CC license). The discussion questions are the same ones used in actual college art classes.

Subject: Art, Music & Creative Practice · Format: Textbook · Cost: FREE

Why we picked it: The only free music appreciation textbook used at actual universities. The audio examples are embedded in the text, which is more useful than a separate playlist.

Subject: Art, Music & Creative Practice · Format: Textbook · Cost: FREE

Why we picked it: The right quick-reference for design principles. Pairs with Laws of UX (also on this list) for a complete design reference. The examples are well-chosen and the citations are real.

Subject: Art, Music & Creative Practice · Format: Textbook · Cost: FREE

Why we picked it: The second-largest free open-textbook collection in North America (after Open Textbook Library). Canadian-produced. The Business Communication textbook is used at universities worldwide.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: The most-used free source for intro financial modeling and Excel. If you want to break into investment banking or corporate finance, the free Financial Modeling primer is the right starting point. CFI is the standard training shop for that career path.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE

Why we picked it: The right place to start if you want a general understanding of economics and personal finance. The personal finance and capital markets sections are particularly good for everyday money management.

Subject: Business, Economics & Finance · Format: Video · Cost: FREE

Why we picked it: The right starting point if you want to start a business but don't have an MBA. Khan covers the basics in 30 short videos — the case studies (Diapers.com, Warby Parker, Airbnb) are the same ones used in $200k MBA programs.

Subject: Business, Economics & Finance · Format: Video · Cost: FREE

Why we picked it: The standard intro micro course. The problem sets are challenging but doable, and the lectures are the actual recordings from MIT's fall semester. By the end you can read the Wall Street Journal and understand every front-page story.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE

Why we picked it: The MIT Sloan corporate finance materials used in the actual MBA course. The case studies (Disney, Marriott, Time Warner) are the same ones taught in the $100k+ MBA program. Free.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: The most authoritative free business textbook library. The Open Textbook Library reviews every book for academic quality — no predatory or low-quality content. If you need a business textbook, this is the right starting point.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: The course that economists and finance professionals keep on their watchlist. Shiller is the only person teaching a free finance course who also won the Nobel Prize. The behavioral finance lectures are unparalleled.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE

Why we picked it: The only free accounting textbook that covers the actual CPA exam material. Used at community colleges and 4-year programs. The video walkthroughs of the accounting cycle are the clearest on the web.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: A real college econ textbook, free. The 3e edition includes updated examples and the 2008 financial crisis lessons. Used at hundreds of universities.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: The only free marketing textbook used at actual universities. The digital marketing chapter is current and the case studies are the same ones used in the $200 marketing textbooks.

Subject: Business, Economics & Finance · Format: Textbook · Cost: FREE

Why we picked it: The right starting point for European free courses. The multilingual courses (often in 6+ languages) are unique. The business and law sections are particularly EU-focused.

Subject: Business, Economics & Finance · Format: Course · Cost: FREE

Why we picked it: The authoritative free genetics glossary — the NIH writes it. If you've ever wondered 'what exactly is a transcription factor?', this is the right reference. The audio pronunciations are a small but nice touch for science vocabulary.

Subject: Chemistry & Biology · Format: Textbook · Cost: FREE

Why we picked it: The only free biology dictionary that doubles as a tutorial. The 'Genetics' and 'Cell Biology' tutorials are the right starting point for AP Bio or intro college. The 7,000+ term dictionary is what every student should bookmark.

Subject: Chemistry & Biology · Format: Textbook · Cost: FREE

Why we picked it: The only free virtual chemistry lab that runs in the browser with real scenarios. Carnegie Mellon-built. The stoichiometry and equilibrium labs are the standard high school supplement. Great for AP Chem review when you don't have access to a physical lab.

Subject: Chemistry & Biology · Format: Interactive · Cost: FREE

Why we picked it: The best way to 'preview' a chem or bio topic before diving into a textbook. Watch 1 episode before reading a chapter, and the chapter will stick. Hank Green is the rare educator who makes complicated things fun.

Subject: Chemistry & Biology · Format: Video · Cost: FREE

Why we picked it: Best free AP Chem and AP Bio prep on the web. The unit tests mirror the actual AP exam format. The human body systems module is also great for general health literacy.

Subject: Chemistry & Biology · Format: Video · Cost: FREE

Why we picked it: The most comprehensive open bio/chem library online. The Anatomy & Physiology book is the most-used free A&P textbook for nursing programs.

Subject: Chemistry & Biology · Format: Textbook · Cost: FREE

Why we picked it: The MIT general chemistry course, with Catherine Drennan's classic textbook and recorded lectures. The most rigorous free general chem course online.

Subject: Chemistry & Biology · Format: Course · Cost: FREE

Why we picked it: Eric Lander's 7.012 is the most comprehensive intro bio course on the open web. The genomics and cancer modules are particularly strong — they reflect Lander's actual research.

Subject: Chemistry & Biology · Format: Course · Cost: FREE

Why we picked it: The right free intro molecular biology course for CS/engineering people. Covers CRISPR and the central dogma in enough detail to actually understand modern biotech. If you've heard about CRISPR but want to know what's actually happening at the molecular level, this is the course.

Subject: Chemistry & Biology · Format: Course · Cost: FREE

Why we picked it: MIT's intro psychology course. Pairs well with the Open Yale intro psychology course — between MIT and Yale, you cover the full intro psych syllabus with the two best lectures on the web.

Subject: Chemistry & Biology · Format: Course · Cost: FREE

Why we picked it: A real college bio textbook, free. The image quality and depth is comparable to Campbell Biology ($250), which is the standard textbook for AP Bio.

Subject: Chemistry & Biology · Format: Textbook · Cost: FREE

Why we picked it: The only AP-aligned chemistry textbook that's free. The 2e edition is full color, has interactive simulations, and the same caliber as a $250 textbook.

Subject: Chemistry & Biology · Format: Textbook · Cost: FREE

Why we picked it: The most-loved free coding event of the year. ~500,000 developers participate annually. The problems are designed to be solvable in any language and reward creative thinking. Use it to learn a new language — many devs pick AoC as their annual 'learn Rust/Go/Clojure' project.

Subject: Computer Science & Programming · Format: Project-Based · Cost: FREE

Why we picked it: The most useful single compilation of free university CS courses on the open web. Each entry points to the actual course page at the university, with all materials free. Better than 99% of MOOC catalogs because the quality bar is high.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right starting point for your first open-source contribution. The list is curated by language and domain, and every project has been vetted for being welcoming to beginners. The 'Good First Issue' label on each project is the standard entry point.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The right free course on computer graphics. The ray tracer and Bezier editor assignments are the most-cited graphics assignments in any curriculum. If you want to understand how 3D rendering actually works, this is the starting point.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right free course if you want SICP-style learning with modern tooling. The 'ants vs bees' OOP lab is the most-cited intro CS lab on the internet. Pair with SICP itself for the classic Scheme-based approach; CS 61A is the modern Python version.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right discrete math + probability course for CS students. The probability lectures are particularly clear — Chris Paucar and his team make Bayesian reasoning click. The right prerequisite for the Berkeley EECS series or any algorithms course.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: CMU's intro course with the most creative homework set in any intro CS class. The 'term project' students have built is the most-cited intro CS project collection on GitHub. If you want a rigorous intro Python course that's not 'learn syntax through toy examples', this is the right choice.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The canonical intro computer systems course. If you want to actually understand how computers execute C code, the 'bomb lab' (reverse engineering a binary) is the most famous assignment in any systems course. The CS:APP textbook is used at 100+ universities; this is the actual course it came from.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right free course for graduate-level algorithms. The LP duality and approximation algorithms lectures are the most-watched in the course. Pairs well with MIT 6.046 — between the two, you cover the full graduate algorithms syllabus.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The most fun way to practice a new language. Codewars is 'chess for code' — solving ranked kata is genuinely satisfying. The community is mature, kata quality is high, and the difficulty ranking is honest. Best for ongoing daily practice (a kata a day).

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The right free course if you want to learn functional programming seriously. OCaml is the language of choice for serious FP (used in Coq, Jane Street, and Facebook's Hack). The course covers the math, the type system, and the practical application. If you've only done Python/JS, this will change how you think about programming.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right free course on how computers actually work. CS 61C teaches the 'machine structures' layer that other CS courses skip. The labs (writing RISC-V assembly, building a CPU simulator, optimizing a matrix multiplier) are the best in any computer architecture course.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: If you only have time to follow one book list, follow this one. 5,000+ books curated by the community, all legal free, organized by subject. The single best starting point for any programming language or CS topic.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The best free platform for learning a new language through practice. The mentor feedback is genuinely useful — real working engineers review your code for free. Far better than LeetCode for learning a language, better than Codecademy for depth.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The fastest way to get over the 'contributing to open source is scary' barrier. The tutorial is 15 minutes, the GitHub UI is right there, and you end with a real PR to a real (training) repo. Use it the day before you make your first real PR to a real project.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The single best 'what free tools can I use for my side project' list. Every entry has been vetted for a real free tier (not just a free trial) and a security-acceptable configuration. Save hours of 'is this tool actually free?' research.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The official Bash reference from GNU. When Greg's Wiki doesn't answer your question, this is the authoritative source. The reference manual is dense but complete — every Bash feature is documented.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The single best free Bash reference on the web. The BashPitfalls page alone will save you hours of debugging. Greg's wiki is what every senior engineer reaches for when writing shell scripts.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The right platform for interview prep when you want company-screen practice. HackerRank certs are accepted by some employers (smaller signal than LeetCode, but free). The skill tracks are also the right starting point for learning a new language — 100+ problems per language.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: David Malan's lectures are a masterclass in teaching. CS50 has the highest completion rate of any massive open course because the production quality is unmatched. The problem sets (especially Tideman) are genuinely fun.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The de-facto platform for technical interview prep. The free tier has more than enough to prepare. Use the NeetCode 150 or Blind 75 list for focused interview prep, or grind by topic. Discussion forums are the best part — the same problem solved 50 different ways.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The single best course for learning the tools CS programs assume you already know. The Shell, Vim, and Git lectures are worth more than any bootcamp. The course is taught by MIT grad students who are themselves still learning — the energy is honest and the content is dense.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The first course MIT students actually take. Better pacing and rigor than 90% of 'learn to code' bootcamps, and the lecture videos are production-quality.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The Strang of algorithms. Demaine's lectures are some of the clearest recordings of any algorithms course on the open web — and the problem sets are the same ones MIT students do.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: MIT's canonical graduate algorithms course. If you've done the intro algorithms course (Sedgewick or MIT 6.006) and want to go deeper, this is the right next step. The problem sets are challenging but doable — they cover the same material as the standard grad algorithms quals.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right free course for serious systems engineering. Most 'performance' courses are about JS or Python; this is real C/C++ performance engineering. The labs (matrix multiplication, ray tracer, parallel sort) are the same ones MIT students do.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The canonical free distributed systems course. The lab (building a sharded, fault-tolerant KV store in Go) is the most-cited distributed systems assignment in any curriculum. If you want to understand how real production systems like Spanner, HDFS, and Raft actually work, this is the starting point.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right free course after you've mastered Sedgewick + MIT 6.006. Demaine is the world expert on advanced data structures (he's the Demaine in 'Skiena and Demaine'). The persistent + retroactive data structures lectures are the most-watched lectures in the course — they appear in research papers for years.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The only data structures textbook that comes in 7 language editions. Pick the language you teach/learn in. Morin's writing is the clearest of any data structures textbook, and the pseudocode edition is the right starting point for any CS student.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The closest thing to a free degree in CS that actually exists. Sourced entirely from MIT, Harvard, Berkeley, and Princeton OCW, with an active community and Discord for support.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The only free OS textbook that reads like a real college course. Remzi and Andrea's writing is the clearest of any OS textbook. The homeworks are real coding challenges (xv6, memory allocation, file system design). Every working systems engineer learned from OSTEP or wishes they had.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: The single best 'build something real' list on the web. 'Build Your Own Text Editor', 'Build a Shell in C', 'Build Your Own Lisp', 'Build an NES Game in C' — these are real projects that teach the language through shipping. Use this list when you're bored of tutorials and want to actually build something.

Subject: Computer Science & Programming · Format: Project-Based · Cost: FREE

Why we picked it: The original 'math + code' platform (2001). The problems reward mathematical insight over code volume — typical solutions are 5-50 lines. The first 50 problems teach number theory, the next 50 cover combinatorics, then probability, geometry, and beyond. The right starting point if you want to think mathematically about code.

Subject: Computer Science & Programming · Format: Project-Based · Cost: FREE

Why we picked it: The most-used free developer roadmap site in the world. If you've ever asked 'what should I learn next?', roadmap.sh has the answer for every developer role. Updated quarterly by the community.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The only free platform for bioinformatics coding practice. If you're learning computational biology, Rosalind is the right starting point. The problems are genuinely useful for molecular biology students, and they double as Python practice.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The only free linter for shell scripts. Use it before committing any non-trivial Bash script — it catches bugs that would take you hours to find manually. The web UI is great; the GitHub version integrates with your editor.

Subject: Computer Science & Programming · Format: Interactive · Cost: FREE

Why we picked it: The book that taught a generation of programmers to think about computation as a model of process, not just code. The 1985 videos (also on OCW) are still watched today.

Subject: Computer Science & Programming · Format: Textbook · Cost: FREE

Why we picked it: If you only have time to follow one curriculum, follow this one. It's the most honest, time-tested path to a real CS education without going back to school.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The best project-based CS curriculum on the open web. You finish with a GitHub portfolio of real apps, not certificates. The Discord is more active and helpful than most paid bootcamps.

Subject: Computer Science & Programming · Format: Project-Based · Cost: FREE

Why we picked it: The right free course to learn Rust for systems programming. UW is the most-respected co-op CS program in the world — their curriculum is what every practical CS program tries to emulate. CS 136 is their take on the intro algorithms course, but with Rust's safety guarantees.

Subject: Computer Science & Programming · Format: Course · Cost: FREE

Why we picked it: The right platform for cryptography practice once you've completed CryptoPals sets 1-8. CryptoHack's challenges are more focused on specific primitives (RSA, ECC, AES) than CryptoPals, and the API design is cleaner. The leaderboard makes it competitive in a fun way.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The best way to actually understand cryptography. Most crypto courses teach the math; CryptoPals teaches you to break it. By set 8 you'll have implemented and broken every major symmetric and asymmetric primitive.

Subject: Cybersecurity · Format: Project-Based · Cost: FREE

Why we picked it: The right calendar for CTF events. Every major CTF (DEF CON quals, Google CTF, HackTheBox, picoCTF) is listed here. Team rankings are public — find a top team in your area and join.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The best free hands-on hacking labs. The free tier is enough to get a complete beginner to junior-pentester level. Combined with PortSwigger Web Security Academy, you'll pass most entry-level security interviews.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The most-watched free cybersecurity YouTube channel. The CTF walkthroughs are a masterclass in thinking through security problems. Subscribe before any CTF event — Hammond's content is the most useful free post-event review.

Subject: Cybersecurity · Format: Video · Cost: FREE

Why we picked it: The most rigorous free security course. The labs (where you exploit real bugs in real systems) are the same ones MIT grad students do. The mobile security module is particularly strong.

Subject: Cybersecurity · Format: Course · Cost: FREE

Why we picked it: The most-watched free IT career YouTube channel. Chuck is a working sysadmin turned instructor — the energy is high and the content is practical. The CCNA and Security+ prep videos are the right starting point for an IT career path.

Subject: Cybersecurity · Format: Video · Cost: FREE

Why we picked it: The original wargame site. 20+ years of active community. Bandit teaches Linux shell the way you actually use it (not the way a textbook does). Natas is the best free web security intro for absolute beginners.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The most authoritative free resource on web app security testing. The WSTG is what professional pentesters and bug bounty hunters use to organize their work. Free PDF download, regularly updated.

Subject: Cybersecurity · Format: Textbook · Cost: FREE

Why we picked it: The best free CTF for beginners. The challenges are calibrated for high-school students but still teach real skills. The binary and web categories are the right starting point for any high school or college student who wants to learn security.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The best free web security training. The labs are real (not simulated) and the writeups after each lab are the most thorough on the web. If you complete the Apprentice and Practitioner paths, you'll pass most web app security interviews.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The right modern platform for learning binary exploitation. The pwnable.kr and pwnable.tw sites are classics, but pwn.college has a much better modern interface and the same problem set. The 'babyshell' and 'rop.0' problems are the right starting point.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The standard junior-pentester course on the market. The free first module is enough to decide if you want to pursue ethical hacking. The paid course (~$30) is the cheapest path to a recognized junior pentester cert. TCM's Discord is the most active free security community.

Subject: Cybersecurity · Format: Course · Cost: FREE

Why we picked it: The Cyber Mentor is the most-watched pentester on YouTube. The free sample content (his full Practical Ethical Hacker intro module is free) is enough to decide if you want to pursue the paid cert. His Discord is the most active free security community.

Subject: Cybersecurity · Format: Video · Cost: FREE

Why we picked it: The best free hands-on cybersecurity learning path. The 'Pre-Security' and 'Introduction to Cyber Security' paths are the right starting point for absolute beginners. Combine with HackTheBox Academy for advanced topics.

Subject: Cybersecurity · Format: Interactive · Cost: FREE

Why we picked it: The right starting point when you want to build a portfolio project and don't know what to build. Each entry is a real working project (not a tutorial), so you can clone the repo, run the code, and then modify it for your own use case. Use this for portfolio prep — pick 3-4 projects from different categories.

Subject: Data Science & Machine Learning · Format: Project-Based · Cost: FREE

Why we picked it: The only free resource with working code for 17+ agent architectures. If you want to build an AI agent (rather than just call an LLM API), this is the starting point. The supervisor and human-in-the-loop patterns are the most production-relevant.

Subject: Data Science & Machine Learning · Format: Interactive · Cost: FREE

Why we picked it: The most-watched deep learning series on the internet. Karpathy (former Tesla AI Director, OpenAI founding member) builds everything from micrograd up to GPT, one lecture at a time. The 'Let's build GPT' and 'Let's build the tokenizer' lectures are required viewing for any serious ML engineer.

Subject: Data Science & Machine Learning · Format: Video · Cost: FREE

Why we picked it: The most current and most curated free GenAI resource list. Where to start for any LLM topic in 2026. The RAG and Agents sections are particularly good — the author reads every paper and ranks them.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The best 'list of lists' for AI/ML on GitHub. Rather than overwhelming you with every awesome-list, this filters to ~30 repos that are actually worth your time. The 'Papers' and 'Computer Vision' sections are particularly curated.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The right weekly ML paper digest. If you want to keep up with ML research without reading 100 papers a week, this is the starting point. The DAIR.AI team is the maintainers of Prompt-Engineering-Guide — they read every paper and only include the interesting ones.

Subject: Data Science & Machine Learning · Format: Research Paper · Cost: FREE

Why we picked it: The single most-cited free prompt engineering resource. The 25+ notebooks are the right starting point for any new prompting technique. Updated monthly as new research is published.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The 'Deep Learning Bible' — the standard reference for deep learning. Every working ML scientist owns a copy. The free HTML edition is the same as the print. Use the deep-learning-papers-reading-roadmap alongside: read each chapter, then the canonical papers it cites.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The right 'what tools do people actually use in production ML' list. Covers the full MLOps stack from training to deployment to monitoring. The MLOps section is the most-cited free resource for production ML.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The right tool for finding the top GitHub users in any field. Use it to discover the people whose work you should follow. The site is updated daily so the rankings are current.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The best deep learning course for working engineers. Howard is the rare teacher who has both the research depth (he invented ULMFiT, helped start Kaggle) and the practical engineering chops to teach you the right way to use the tools.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: A well-maintained list of free AI courses across the major AI subfields. The NLP and Computer Vision sections are particularly good — most other lists focus on ML/DL and skip these. The list is opinionated (only courses the curator has vetted) which is the right call.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The most polished free ML course. Google's case studies (identifying cranes from satellite imagery, detecting bias in loan applications) teach you how ML is actually used in industry, not just the theory.

Subject: Data Science & Machine Learning · Format: Interactive · Cost: FREE

Why we picked it: The only free resource that asks you to implement every ML algorithm from scratch in Python. If you've ever called scikit-learn without understanding what it does, this is the right course. By the end you'll have a deep understanding of how linear regression, gradient descent, and backprop actually work.

Subject: Data Science & Machine Learning · Format: Interactive · Cost: FREE

Why we picked it: The most up-to-date free NLP course. Built by the team behind the most-used open-source ML library. By the end you'll have fine-tuned a real model and pushed it to the Hugging Face Hub.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The right starting point for ML interpretability. The right list if you want to explain to non-technical stakeholders why a model made a prediction. SHAP and LIME are the standard tools, and this list shows you when to use each.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The best hands-on intro to the Python data science stack (pandas, scikit-learn, TensorFlow, SQL). Each course has a free completion certificate, and you build real models in the browser — no install needed.

Subject: Data Science & Machine Learning · Format: Interactive · Cost: FREE

Why we picked it: The only free ML course that covers the full MLOps lifecycle — not just model training. Goku Mohandas is the rare teacher who has both the data science and the production engineering background. Use this if you want to actually ship an ML product, not just train a model.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The right answer to 'I want to learn ML — what math do I need?' This 1-hour read saves you months of wandering. The recommended resources are the same ones the best ML practitioners use.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The most polished free course on building AI agents. Microsoft's docs team writes the clearest production-oriented tutorials. Use it as a 12-week curriculum if you want to become an AI engineer in 2026.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The right free curriculum for 'I have never done AI, where do I start?' The Microsoft docs team writes the clearest production-quality tutorials. The course covers symbolic AI (not just LLMs), which gives you a more complete foundation.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The only free 10-week data science curriculum that runs entirely in the browser. Microsoft's docs team writes the clearest production-quality tutorials. Use this if you've never done data science before — by the end you'll have a real portfolio of 6-8 projects.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The right MIT course to take AFTER 6.0001 (or any intro CS). Covers the data science pipeline end-to-end. The optimization and statistical inference modules are particularly good.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The best deep learning course for working engineers. Howard is the rare teacher who has both the research depth (he invented ULMFiT, helped start Kaggle) and the practical engineering chops to teach you the right way to use the tools. The free book + video + notebooks are enough to ship a real DL product.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The single most-cited free prompt engineering resource. Where to look up any prompting technique. The 'Prompt Hacking' and 'Defenses' sections are the right starting point for anyone building production LLM apps.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The most-watched free RAG tutorial. If you're going to build a RAG system, this is where to start. LangChain is the most-used LLM framework, and Chase's teaching is the canonical introduction to the architecture.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The only free resource that shows you the code for 30+ RAG techniques. Each technique is a runnable notebook. Use it as a starting point for any LLM application — copy a notebook, swap your data, ship.

Subject: Data Science & Machine Learning · Format: Interactive · Cost: FREE

Why we picked it: The only free book that walks through implementing an LLM from scratch. Raschka is the rare author who actually understands the math AND can write production-quality code. The book is currently the most-cited free resource for understanding GPT architecture in 2025-2026.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The single best free AI course. Stanford's CS221 is the standard intro AI course in the US. The YouTube lectures are the actual recordings from Percy Liang's class. The homeworks are challenging but doable. Use this as your year-long AI course if you want a real CS foundation.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The most-watched free ML course in the world. Andrew Ng's CS229 is the standard graduate-level intro ML course. The 2018 recordings are the most comprehensive. The 2022 recordings are the most current. Pick whichever year, and you'll learn what every serious ML practitioner knows.

Subject: Data Science & Machine Learning · Format: Course · Cost: FREE

Why we picked it: The best 'explain it like I'm 5' channel for statistics and ML. Starmer is the rare teacher who makes hypothesis tests and gradient descent feel intuitive. Watch his gradient boosting series before any interview prep.

Subject: Data Science & Machine Learning · Format: Video · Cost: FREE

Why we picked it: The book that working ML scientists keep on their desk. Hastie, Tibshirani, and Friedman invented much of what they teach. ESL is the gold standard for rigorous understanding of ML — there is no better free book.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The right 'I need a tool for X' list for sysadmins and devops. Most lists focus on one topic; this one is comprehensive. The networking and security sections are the most useful.

Subject: Data Science & Machine Learning · Format: Textbook · Cost: FREE

Why we picked it: The most complete free electronics textbook online. The author (Tony Kuphaldt) is the rare technical writer who explains things clearly enough to use without a professor. Has a forum where working engineers answer questions.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Textbook · Cost: FREE

Why we picked it: These are the actual FAA handbooks used for A&P certification. Public domain means you can download them all for free and study at your own pace. If you want to be an aircraft mechanic, this is the canonical source.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Textbook · Cost: FREE

Why we picked it: The right place to start if you've never seen a circuit before. The embedded simulators let you actually build the circuits as you watch, which is something most EE textbooks don't offer.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Video · Cost: FREE

Why we picked it: The only free mechanics textbook with embedded video walkthroughs. Penn State engineering uses it. If you need to learn statics or dynamics on your own, this is the right starting point — and the videos are professionally produced.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: The intro course every mechanical and civil engineer takes. The image gallery of real material failures (the Hyatt Regency walkway collapse, the Aloha Airlines fuselage, the Liberty Ship fractures) is alone worth a look.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: The class that makes Fourier transforms feel like a natural language. Oppenheim's textbook is the standard, but his lectures are even better — the problems are the same ones MIT students do.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: MIT is the top aerospace school in the US. The OCW sub-folder has 30+ free aerospace courses — including the famous 16.100 (Aerodynamics) and 16.20 (Structural Mechanics). If you want to study aerospace seriously, this is the starting point.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: The only free open-course catalog from a real public school that covers K-12 + intro college engineering. If you're a high school student interested in engineering, this is the right starting point — and if you're a teacher, the curriculum is free to use.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: Used at hundreds of universities. The University Physics book is the closest thing to a free Young & Freedman — the standard intro calc-based physics text. The problem sets are the same caliber.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Textbook · Cost: FREE

Why we picked it: The most comprehensive open engineering textbook library. The Intro to EE and Intro to Civil books are the same caliber as a $200 Wiley or Pearson textbook, but free and online.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Textbook · Cost: FREE

Why we picked it: The most-used free science simulation in the world. Used in 100+ countries for K-12 and intro college physics. The 'Pendulum Lab' and 'Circuit Construction Kit' are the most-clicked simulations in any physics class. The reason: when you can actually move a charge around a wire, voltage isn't a mystery anymore.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Interactive · Cost: FREE

Why we picked it: The most hands-on free electronics tutorial site. SparkFun is the leading hobbyist electronics retailer — they know what beginners need. The Arduino, soldering, and basic electronics tutorials are the right starting point for any hardware hobbyist.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: UBC CS is one of the top 5 programs in Canada. CPSC 221 is their algorithms course with a heavier programming emphasis than most — the assignments are real working code, not pseudo-code.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: The right free intro EE series if you want to actually build circuits, not just learn theory. The EE 16B music recommender lab is the most-cited EE lab in any intro course. The labs (touch screen, RISC-V, music recommender) are the same ones Berkeley EE students do.

Subject: Engineering (electrical, mechanical, civil, aerospace) · Format: Course · Cost: FREE

Why we picked it: The largest single free library on the open web. If a book exists, Anna's Archive likely has a free mirror. The non-profit founders' goal is 'to make all human knowledge truly accessible to everyone.' Search-first, browse by topic, language, and year.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The BBC's free school subject platform — same BBC production quality, for free. The right resource for any UK school subject, or for anyone who wants British-style primary/secondary education. The interactive lessons are high quality.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The BBC's free video library. Same production quality as BBC documentaries, free for schools. The right starting point for any school subject — history, science, English — at primary/secondary level.

Subject: Humanities (history, philosophy, literature) · Format: Video · Cost: FREE

Why we picked it: The original and most-trusted free digital library. 44+ million texts, 78+ million audio recordings, plus the Wayback Machine (web archive) and Open Library (modern ebook lending). The single most important non-profit on the web for research.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The only free audiobook service for public-domain literature. The volunteers are surprisingly good readers — many of the Sherlock Holmes, Jane Austen, and Sherlock Holmes recordings are listenable. Free MP3 download, no DRM.

Subject: Humanities (history, philosophy, literature) · Format: Audiobook · Cost: FREE

Why we picked it: The right free modern world history course. Pairs with the Open Yale Roman and English history courses for a full world history foundation.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The right free Roman history course from MIT. Pairs with the Open Yale course on Early Modern England for a full 'Western Civ' foundation.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The right free literature course on Homer. The Iliad and Odyssey are the foundation of Western literature — and this is the MIT course that covers both.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The single best free source for modern ebooks. If your local library doesn't have an ebook, Open Library likely does. 14-day loans, free, no ads. The catalog is also a great search tool for any book.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The only major diamond open-access humanities publisher. Free to read, free to publish (no APCs). The journals are legitimate, peer-reviewed, and indexed in major databases. If you want to read or publish humanities scholarship without paywalls, OLH is the right home.

Subject: Humanities (history, philosophy, literature) · Format: Research Paper · Cost: FREE

Why we picked it: The best free English history course online. Wrightson's coverage of the Civil War and the Glorious Revolution is the clearest you'll find anywhere — better than most $200 survey textbooks.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The best free political philosophy course online. Smith's coverage of Machiavelli and Locke is particularly good. The lectures move at a pace that respects the audience without slowing down the argument.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The course that intro psych instructors cite. Bloom is one of the most respected psychologists in the world, and his lectures are beautifully produced. The moral psychology and happiness modules are particularly strong.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: A real intro philosophy textbook, free. The primary source excerpts are the same ones used in the standard $200 intro philosophy anthologies. Better than Norton or Hackett at one-tenth the cost.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The most current free U.S. history textbook. The 4e edition includes extensive coverage of the Trump era, the 2020 election, and the Jan 6th committee. Better than most AP U.S. History prep books.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The single best place to download free literature. 70,000+ public-domain books, all formatted for any device, all free, all legal. If you read one classic this year, read it from Gutenberg.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The best-looking free ebooks on the web. Every book is hand-typeset, properly edited, and formatted for every reading device. If you read public-domain literature, this is how you want to read it.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: A cleaner, faster alternative to Library Genesis. Same content, more reliable hosting. If a paper or book isn't on Anna's Archive, it's probably here.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The only large-scale free collaborative textbook library. The 'Subject:Computing', 'Subject:Mathematics', and 'Subject:Spanish' books are the standard free references in those fields. Anyone can contribute — high-quality submissions get reviewed and featured.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The most accurate free source for out-of-copyright literature and historical documents. Every text is proofread by humans, not OCR. The right place to read Shakespeare, Plato, the Federalist Papers, or the U.S. Constitution with the original spelling.

Subject: Humanities (history, philosophy, literature) · Format: Textbook · Cost: FREE

Why we picked it: The right place to find free university-level course materials on any subject. The 'Portal:Mathematics' and 'Portal:Physics' are particularly well-developed. Use it to find lesson plans and learning resources that other teachers have vetted.

Subject: Humanities (history, philosophy, literature) · Format: Course · Cost: FREE

Why we picked it: The most-used study tool in medical school and language learning. Spaced repetition is the most evidence-backed study method. The community decks cover every language, plus med school, law school, and most college subjects.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: The most-used study tool in medical school and language learning. Spaced repetition is the most evidence-backed study method. The community decks cover every language, plus med school, law school, and most college subjects.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: BBC-quality production values for free. The 'A Day in the Life' videos (where native speakers act out scenarios) are the best free listening comprehension practice for any European language.

Subject: Languages · Format: Course · Cost: FREE

Why we picked it: The most-used language app in the world for a reason. The streak mechanic works — most users who make it 30 days actually keep going. Free tier teaches the language; Plus just adds hearts and removes ads. Don't pay.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: The most-used free language app in the world. The streak mechanic works — most users who make it 30 days actually keep going. Free tier teaches the language; Plus just adds hearts and removes ads. Don't pay.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: The only free pronunciation guide that actually has every language. If you've ever wondered 'how do you actually say that word?', Forvo has a native speaker saying it. Critical for languages with non-Latin scripts (Mandarin, Arabic, Hindi).

Subject: Languages · Format: Audiobook · Cost: FREE

Why we picked it: The closest thing to a free language school. The FSI's audio-based immersion method works. If you want to learn a language that Duolingo doesn't cover (Dari, Amharic, Burmese), this is the only free option that's actually complete.

Subject: Languages · Format: Course · Cost: FREE

Why we picked it: The most-affordable 1-on-1 language tutoring. The $5-15/hr range is 1/10 the price of in-person tutors. Use it as a complement to any free app (Duolingo, Anki, etc.) — the conversation practice is what makes you fluent. italki has a 'free trial' so you can try before committing.

Subject: Languages · Format: Video · Cost: FREE

Why we picked it: The only free audiobook service for public-domain literature. The volunteers are surprisingly good readers — many of the Sherlock Holmes, Jane Austen, and Edgar Allan Poe recordings are listenable. Free MP3 download, no DRM. Use it to learn by listening to native speakers read great literature.

Subject: Languages · Format: Audiobook · Cost: FREE

Why we picked it: The most-comprehensive free phrase book on the web. 50+ languages with ~300 phrases each, all with audio. The right starting point if you need to learn 'hello' in 50 languages, or if you want a quick refresher before a trip.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: The best free language-learning platform if your local library has it. Mango's film-based approach (every lesson is built around a real conversation) is the right way to learn speaking, not just vocabulary. Free with a US library card.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: The right app for vocabulary + phrase learning. The video clips of native speakers (rather than just text/voice) help you learn the actual sounds. Use it alongside Duolingo for vocabulary reinforcement.

Subject: Languages · Format: Interactive · Cost: FREE

Why we picked it: MIT-quality language instruction. The Chinese and Japanese courses are the best free college-level courses for those languages. The audio recordings of native speakers are particularly useful.

Subject: Languages · Format: Course · Cost: FREE

Why we picked it: The single best index of free language learning resources on the web. If you can't find it on Open Culture, it doesn't exist for free. The Arabic and Chinese collections are particularly deep.

Subject: Languages · Format: Video · Cost: FREE

Why we picked it: The antidote to 'I can do the algebra but I don't get what it means.' Watch the first 3 videos and you'll understand derivatives better than most high school graduates.

Subject: Mathematics · Format: Video · Cost: FREE

Why we picked it: The best visual explanation of linear algebra on the internet. Watch this BEFORE you tackle Strang — by the time you get to eigenvalues, the math will already feel familiar.

Subject: Mathematics · Format: Video · Cost: FREE

Why we picked it: The only platform where the same content teaches both regular math and olympiad math. The AoPS approach (problems first, then theory) is the right way to actually internalize math. Use the AoPS Wiki as a math reference for any concept from middle school through intro college.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: The only free resource for olympiad-level math problem solving. The AoPS Wiki is the standard reference for the MATHCOUNTS, AMC, AIME, and USAMO. The Alcumus adaptive set is a real 'learn by doing' platform.

Subject: Mathematics · Format: Interactive · Cost: FREE

Why we picked it: The best resource on the web for the 'I can do the algebra but I don't get what it means' problem. Kalid Azad's writing is the right antidote to memorize-the-formula math education. Read his 'Vector Calculus' article before any ML class.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The best resource on the web for the 'I can do the algebra but I don't get what it means' problem. Kalid Azad's writing is the right antidote to memorize-the-formula math education. Read his 'Vector Calculus' article before any ML class.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The Bayes' Rule PDF alone is worth more than most statistics textbooks. Download all three; they're short, beautifully illustrated, and the right starting point for adult learners who don't have a strong math background.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The interactive companion to 3Blue1Brown. Where Strang teaches the math, this site lets you actually rotate the vectors. Read this after watching the Essence of Linear Algebra videos — by the end you'll have a real spatial intuition for SVD.

Subject: Mathematics · Format: Interactive · Cost: FREE

Why we picked it: The single best place to fill in any math gap from elementary school through AP. The practice exercises generate unlimited problems with instant feedback. Use the unit test at the end of each section to validate you actually learned it.

Subject: Mathematics · Format: Video · Cost: FREE

Why we picked it: Better pacing than most AP Calculus courses. The problem sets are challenging but doable, and the lecture videos are the actual recordings from MIT's fall semester.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: The course that every ML practitioner eventually works through. Strang is the gold standard — the way he builds intuition for SVD alone is worth the time. Used in MIT's actual undergrad curriculum.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: The right intro proof course for serious mathematics. Drinfeld is one of the few Fields Medalists who teaches intro courses — and his lectures are the most-watched. If you've ever wanted to understand why math majors start with 'intro to proofs' and not calculus, this is that course.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: MIPT is the most-respected physics + math school in Russia — their open courses rival MIT OCW in depth. If you've burned through MIT OCW, MIPT's catalog is the right next place to look, especially for advanced math (they have a full real analysis sequence) and physics.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: A real college textbook, free, with no asterisks. Used at hundreds of universities. If you need to learn calculus from a book and not a video, this is the one to use.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The only AP-aligned statistics textbook that's free. Better than most $200 stats textbooks, with the same exercises and learning objectives.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The cleanest, most worked-example-heavy math notes on the open web. Paul's differential equations notes are particularly good — many students say they're clearer than their $300 textbook.

Subject: Mathematics · Format: Textbook · Cost: FREE

Why we picked it: The right free course for the 'real' Sedgewick & Wayne curriculum. Sedgewick is one of the founders of modern algorithm analysis — his textbook Algorithms (4th ed) is the standard. The 8-week assignments (8 Puzzle, Burrows-Wheeler, base64, K-d tree, wordnet) are the most cited in any algorithms course.

Subject: Mathematics · Format: Course · Cost: FREE

Why we picked it: The most-comprehensive free robotics resource list. The simulator and ROS sections are the right starting point if you want to start a robotics project. Combine with the OpenAI Gym and a 3D simulator, and you can do research at home.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The best free game development course. Colton Ogden's lectures teach you the patterns that all games use (entity-component, physics, collision detection, AI). By the end you'll have 8 working games in your portfolio.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The only free platform with mentor-graded practice for Swift, Kotlin, and Dart. If you want to learn iOS or Android through actual coding, this is the right starting point. Far better than Apple's or Google's scattered docs.

Subject: Mobile & Game Development · Format: Interactive · Cost: FREE

Why we picked it: Godot is the open-source, royalty-free game engine. The docs are unusually good for a game engine — the 'Your First 2D Game' tutorial is one of the best intros to game dev anywhere. Better than Unity's docs for a beginner.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The right cookbook for Godot 4. The official docs cover the API, but the Recipes cover 'how do I actually do X'. Each recipe is a working Godot project — copy the pattern, change the values, ship.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The official Kotlin tutorial. If you already know Java (or any C-family language), you can have a working Kotlin app in 30 minutes. The official docs are the best intro — JetBrains knows their own language.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The easiest way to start building mobile apps. If you've never written a line of code but want to build an Android app, MIT App Inventor is the right starting point. Real apps, real install on your phone, no install required on your computer.

Subject: Mobile & Game Development · Format: Interactive · Cost: FREE

Why we picked it: The right starting point for indie game developers with no art budget. The CC0 (public domain) section is the most useful — you can use the art commercially without attribution. 100k+ assets.

Subject: Mobile & Game Development · Format: Textbook · Cost: FREE

Why we picked it: The official source for learning Swift. The Swift Book is the canonical language reference. Apple's A Swift Tour is the fastest way to see what the language looks like in a real editor.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The official Unity learning platform. The free tier has more than enough content to get you from zero to a working 3D game. The Unity Essentials pathway is the right starting point.

Subject: Mobile & Game Development · Format: Video · Cost: FREE

Why we picked it: If you want to use Unreal (or just learn how AAA games are built), this is the official source. The blueprints (visual scripting) courses let you build gameplay without writing C++.

Subject: Mobile & Game Development · Format: Course · Cost: FREE

Why we picked it: The single best math + AI visualization channel on the web. Every video is hand-animated. The neural network series is the most-watched AI tutorial on YouTube, and the math series (especially linear algebra) is required viewing for any ML practitioner. The 'Attention' video alone is worth subscribing.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The right quick-reference for any general knowledge topic. Higher quality than Wikipedia for academic and historical topics — every article is reviewed by an expert before publication.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The right tool when you see a complex shell command and want to understand what it does. Saves hours of searching StackOverflow. Bookmark it before your next 'what does this command do?' moment.

Subject: Personal Development & Productivity · Format: Interactive · Cost: FREE

Why we picked it: The best 'learn something in 5 minutes' channel. Every video is dense — you get the actual concept, not a 30-minute preamble. The 100-second format is perfect for software engineers who already know the basics. Use it as your daily tech news / continuous learning feed.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The only free personal finance site run by a regulator (not a bank or brokerage). No upsells, no ads, no 'open a Robinhood account' prompts. Use it to learn investing before you ever put money in the market.

Subject: Personal Development & Productivity · Format: Course · Cost: FREE

Why we picked it: The single largest free educational platform in the world. Khan covers every K-12 + intro college subject with the same high quality. Use it as your default 'I need to learn X' resource — math, science, history, economics, computer science, SAT/MCAT prep. The 'Mastery' mode is the right way to use it.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The right free intro psychology course for most people. Short videos, lots of practice, and the unit tests cover the same material as AP Psychology. Use it as a foundation before tackling Bloom's Yale course.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The right starting point for the kind of life skills school doesn't teach. Khan covers personal finance, mental health, college apps, and career planning in the same style as the rest of the site — short, clear, and free.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The best free personal finance course on the web. Khan covers everything from 'what is a checking account' to 'how do I pick an index fund'. The investing section alone is worth more than a $200 financial advisor session.

Subject: Personal Development & Productivity · Format: Video · Cost: FREE

Why we picked it: The Library of Congress is the largest library in the world, and they make the public-domain material free online. The right starting point for primary source research on any US history or cultural topic.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The right free source for high-school-level subjects. The AP and dual-enrollment courses are college-prep quality. If you're a homeschooler or want to review high-school math/science, this is the starting point.

Subject: Personal Development & Productivity · Format: Course · Cost: FREE

Why we picked it: The only free intro education textbook. If you want to become a teacher, this is the right starting point. Used at community colleges and 4-year programs alike.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The most current free intro sociology textbook. The 3e edition has new chapters on social media, climate change, and the gig economy. Better than most AP Sociology prep books.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The most-used free intro psychology textbook in the world. Better than most $200 textbooks. The 2e edition is the most current.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The most current free intro sociology textbook. The 3e edition has new chapters on social media, climate change, and the gig economy. Better than most AP Sociology prep books.

Subject: Personal Development & Productivity · Format: Textbook · Cost: FREE

Why we picked it: The most beautiful physics textbook ever written. Feynman's intuition is unmatched — Volume 1 Chapter 9 (Newton's laws in rotating coordinates) alone is worth the price of admission, and the price is free.

Subject: Physics & Astronomy · Format: Textbook · Cost: FREE

Why we picked it: The best physics reference on the web. Use it when you need to look up a formula or refresh a concept, not as a primary textbook. The concept-map navigation makes it faster than any index for finding what you need.

Subject: Physics & Astronomy · Format: Textbook · Cost: FREE

Why we picked it: The right starting point if you're an AP Physics student. The exercises have instant feedback and the videos are short enough to watch between classes. The unit tests mirror the AP exam format.

Subject: Physics & Astronomy · Format: Video · Cost: FREE

Why we picked it: LibreTexts is the most ambitious open textbook project in existence. The physics library is the largest free collection of college-level physics material anywhere. Books are remixable under Creative Commons.

Subject: Physics & Astronomy · Format: Textbook · Cost: FREE

Why we picked it: The right free intro nuclear physics course. Covers both fundamentals and applications (energy, medicine, weapons) honestly. The right course if you want to understand how nuclear energy actually works — beyond the clickbait.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: Lewin's lectures are the most-watched physics videos in history. His demonstrations (dropping a brick from a meter stick, swinging from a ceiling) are unforgettable. The fact that he was later removed from MIT is irrelevant — these are still the best mechanics lectures on the web.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: The companion to 8.01. Lewin makes Maxwell's equations feel inevitable rather than magical. The problem sets are challenging and worth doing — the final exam is famously hard.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: The right free neuroscience course for technical people. Michale Fee teaches the way you'd want a friend to teach you — focuses on what we actually know and what we don't. The right course if you want to understand how the brain works at a computational level.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: The full MIT physics curriculum, free. ~50 courses covering everything from intro mechanics to particle physics. Use this as the starting point for any physics topic — the sub-folder structure lets you browse by topic and level.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: The most current intro astronomy textbook online. The 2e edition includes JWST results and updated exoplanet science. Free PDF, full color, no compromises.

Subject: Physics & Astronomy · Format: Textbook · Cost: FREE

Why we picked it: The single best free physics YouTube channel. Matt O'Dowd has the rare combination of deep physics PhD + ability to explain it in 15 minutes. The quantum mechanics and cosmology series are the most accurate free explanations on the web.

Subject: Physics & Astronomy · Format: Video · Cost: FREE

Why we picked it: The right free course for the modern physics topics (quantum, string theory, dark matter) that standard intro courses skip. Annenberg Learner is the same publisher that made 'The Mechanical Universe'. Free, high production value, no paywall.

Subject: Physics & Astronomy · Format: Course · Cost: FREE

Why we picked it: The first place any scientist posts their work. If a paper isn't on arXiv, it doesn't exist. Free to read, free to submit, the largest open repository of research in the world.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The first place any scientist posts their work. If a paper isn't on arXiv, it doesn't exist. Free to read, free to submit, the largest open repository of research in the world.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The right starting point for finding an AI tool for any task. Search by category (NLP, CV, etc.) or by task ('summarization', 'translation', 'voice cloning'). Each entry is vetted for being a real working tool, not vaporware.

Subject: Research Papers & Journals · Format: Textbook · Cost: FREE

Why we picked it: The single most-comprehensive free data science resource list. Where to start when you want to learn a new DS topic. The courses and tutorials sections are the most curated. The datasets section is the right starting point for any DS project.

Subject: Research Papers & Journals · Format: Textbook · Cost: FREE

Why we picked it: The most comprehensive index of legitimate open-access journals. If you want to find a free peer-reviewed paper in a specific field, DOAJ is the starting point. Avoids the predatory-journal problem by vetting every entry.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The default search engine for academic work. If you can't find a paper on Google Scholar, it doesn't exist (or it's behind a paywall and you'll need a library). The 'Cited by' link is the standard way to follow research forward in time.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The default search engine for academic work. If you can't find a paper on Google Scholar, it doesn't exist (or it's behind a paywall and you'll need a library). The 'Cited by' link is the standard way to follow research forward in time.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The only way to read JSTOR's humanities and social-sciences content without a university library. The open-access subset is a small fraction of JSTOR's full collection, but it includes some of the most important humanities journals.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The most open and most complete scholarly catalog. The free API is the standard way to build bibliometric tools, lit reviews, and research dashboards. If you need to do a comprehensive literature review, OpenAlex is the foundation.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The largest open-access peer-reviewed journal. PLOS ONE publishes sound science across all fields, with no perceived 'prestige' cutoff. Every paper is free to read, free to share, and free to redistribute.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The largest open-access peer-reviewed journal. PLOS ONE publishes sound science across all fields, with no perceived 'prestige' cutoff. Every paper is free to read, free to share, and free to redistribute.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The only free full-text repository for biomedical research. If you want to read the actual paper behind a medical news story, this is where you find it. The PubMed search engine is the standard way to search the medical literature.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The only free full-text repository for biomedical research. If you want to read the actual paper behind a medical news story, this is where you find it. The PubMed search engine is the standard way to search the medical literature.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The best free academic search engine for finding the most influential papers in a field. The 'Highly Influential Citations' filter is the most accurate way to find the canonical papers. The free API lets you build research tools.

Subject: Research Papers & Journals · Format: Research Paper · Cost: FREE

Why we picked it: The best free HVAC troubleshooting channel. Sam Myers is a working tech with 20+ years experience, and his videos walk through real problems on real equipment. Pair with HVAC School for the complete free HVAC curriculum.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The only free welding resource that actually teaches you how to weld. Collier is a working welder with decades of experience, and his 'mig welding settings chart' video is the most-watched welding tutorial on YouTube.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The most-watched free HVAC training on the web. Bryan Orr is a working HVAC technician with decades of experience, and his 'mig welding settings chart' video is the most-watched welding tutorial on YouTube. The podcast is required listening for working HVAC techs.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The best free HVAC training on the web. Both channels are run by working technicians who have taught at HVAC trade schools. The electrical and refrigeration series are the most complete free technical training for HVAC.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The best free AP Macro prep. The unit tests mirror the actual AP exam format. Use it in conjunction with the OpenStax textbook to prep for the AP exam.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The best free accounting course. Polak's coverage of the accounting equation and the cash flow statement is the clearest on the web. By the end you can read a 10-K filing.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE

Why we picked it: The largest free workforce development library. Most courses are professional-grade (built by community colleges and trade schools). The HVAC, welding, and electrical collections are particularly strong.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE

Why we picked it: The largest free workforce development library. Most courses are professional-grade (built by community colleges and trade schools). The HVAC, welding, and electrical collections are particularly strong.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE

Why we picked it: The most-hands-on free electronics tutorial site. SparkFun is the leading hobbyist electronics retailer — they know what beginners need. The Arduino, soldering, and basic electronics tutorials are the right starting point for any hardware hobbyist.

Subject: Trade & Vocational Skills · Format: Course · Cost: FREE

Why we picked it: The only free welding resource that actually teaches you how to weld. Collier is a working welder with decades of experience, and his 'mig welding settings chart' video is the most-watched welding tutorial on YouTube.

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The most-respected free welding channel for working welders. The pipe welding and stainless steel series are particularly good. Pair with Welding Tips & Tricks for the complete free welding curriculum (beginner to advanced).

Subject: Trade & Vocational Skills · Format: Video · Cost: FREE

Why we picked it: The most-cited free web design publication. The articles are written by the people who defined the field. Use it as the right reference for any web design question — most modern best practices were first articulated here.

Subject: Web Development & Design · Format: Textbook · Cost: FREE

Why we picked it: The single best free resource on web accessibility. The checklist is the standard reference for shipping accessible web products. Every frontend team should bookmark the Patterns section.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The most accessible free design school. Canva's tutorials are short and practical. Use it as a starting point for any design skill (typography, color, layout) — the lessons translate to any tool.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The best free full-stack web development course. The final project (a CS50 finance app or a mail client) is a real portfolio piece. David Malan's teaching style carries over — the production quality is unmatched.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The de-facto pre-launch checklist for web projects. Use it as a final pass before any site goes live. The accessibility and security sections catch 80% of common launch-blocking issues.

Subject: Web Development & Design · Format: Textbook · Cost: FREE

Why we picked it: The best free JavaScript reference. Coverage of ES2015+ features (promises, async/await, modules, classes) is more current and more thorough than MDN's. Used by working engineers, not just beginners.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The right quick-reference for UX principles. The site is well-designed and the principles are real (each has a research citation). Use it as a check-list when reviewing any UI design.

Subject: Web Development & Design · Format: Textbook · Cost: FREE

Why we picked it: The most accurate, up-to-date, comprehensive web platform reference on the open web. If you write HTML, CSS, or JavaScript, you should have MDN open. The 'Learn' tracks are also the best free intro to web dev for absolute beginners.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The most practical free UI design book for developers. Adam Wathan is the creator of Tailwind CSS — the book is the most-cited free UI resource. The free blog content alone will change how you approach UI design.

Subject: Web Development & Design · Format: Textbook · Cost: FREE

Why we picked it: The highest-quality free web design/development content. Smashing's articles are the standard reference for any CSS technique, accessibility pattern, or UX research summary. Bookmarked articles from Smashing appear in every senior web dev's reading list.

Subject: Web Development & Design · Format: Textbook · Cost: FREE

Why we picked it: If you want to learn Ruby on Rails (still the most-used backend for new startups) this is the only free, project-based curriculum worth using. The Rails section is the deepest free Rails tutorial on the web.

Subject: Web Development & Design · Format: Project-Based · Cost: FREE

Why we picked it: The right React curriculum if you've already done the Odin Project JS path. The 4 projects cover the patterns that hiring managers actually test for in React interviews. No fluffy 'let me show you what a component is' — you build from day one.

Subject: Web Development & Design · Format: Project-Based · Cost: FREE

Why we picked it: The official TypeScript docs are the best free TypeScript resource. Microsoft's TS team writes the clearest, most current documentation in the JS ecosystem. Use the Handbook as a free full course — by the end you'll be able to migrate any JS project to TS.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The official W3C guide to accessible UI patterns. Every pattern includes both the design pattern and a working HTML example. If you're building any interactive component (menu, dialog, autocomplete), start here — the patterns are designed to be keyboard-navigable, screen-reader compatible, and WAI-ARIA compliant.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: The best 'what web skills should I know' visual. Use it as a career map — see what you've covered, what you're missing, and where to focus. The mind map is the most usable form of the 'full-stack web dev' guide.

Subject: Web Development & Design · Format: Interactive · Cost: FREE

Why we picked it: Google's web platform team teaching web development. The web performance and accessibility courses are particularly strong — taught by the people who actually build Chrome DevTools and Lighthouse.

Subject: Web Development & Design · Format: Course · Cost: FREE

Why we picked it: Google's web platform team teaching web development. The performance and accessibility courses are particularly strong — taught by the people who actually build Chrome DevTools and Lighthouse. The PWA course is the standard for any team building an offline-capable web app.

Subject: Web Development & Design · Format: Course · Cost: FREE