# Free online courses worth taking

Free and legal: whole MIT courses with lectures and notes on OpenCourseWare, Harvard’s famous CS50 introduction to programming, freeCodeCamp’s web development curriculum, the Elements of AI course for non-experts, university courses on edX and languages on Duolingo. A teacher can show the class the set’s QR code – “QR code” is above the list.

Open in urlhub: https://urlhub.cloud/s/en/free-online-courses

1. [MIT OpenCourseWare | Free Online Course Materials](https://ocw.mit.edu/) – MIT OpenCourseWare
   MIT OpenCourseWare is a web based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity
2. [CS50x 2026](https://cs50.harvard.edu/x/) – cs50.harvard.edu
   This is CS50, Harvard University’s introduction to the intellectual enterprises of computer science and the art of programming, for concentrators and...
3. [freeCodeCamp.org](https://www.freecodecamp.org/) – freecodecamp.org
   Learn to Code for Free
4. [A free online introduction to artificial intelligence for non-experts](https://www.elementsofai.com/) – Global
   Learn more about MinnaLearn's and the University of Helsinki's AI course - no programming or complicated math required.
5. [edX | Online Courses, Certificates & Degrees from Leading Institutions](https://www.edx.org/) – edX
   Find the online learning path for you, delivered by world-class institutions like Harvard, Google, Amazon, and more.
6. [Duolingo](https://www.duolingo.com/) – Duolingo
   Duolingo to najpopularniejsza metoda nauki języków na świecie. Za darmo, w formie zabawy, z naukowo potwierdzoną skutecznością. Ćwicz online (duolingo.com lub aplikacje)!

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Titles and descriptions come from the linked pages; urlhub does not check them.
urlhub.cloud: link sets to share with one link or a QR code. For machines: /llms.txt