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Computer science & programming

Learn to code from scratch: logic, algorithms, web development, Python and more, with free courses and practice.

35 free sites · 32 in English.

1. CS50x (Harvard) English cs50.harvard.edu

   Harvard’s famous introduction to computer science.

   For: Middle & high schoolCollegeGeneral public

2. Khan Academy – Computing English khanacademy.org

   Programming, algorithms and the internet.

   For: Middle & high schoolCollege

3. freeCodeCamp English freecodecamp.org

   Full web development curriculum with certifications.

   For: General public

4. The Odin Project English theodinproject.com

   A complete path to becoming a web developer.

   For: General public

5. MDN Web Docs English developer.mozilla.org

   The reference for HTML, CSS and JavaScript.

   For: General public

6. MIT OCW – Intro to CS and Programming in Python English ocw.mit.edu

   Complete MIT course.

   For: College

7. The Python Tutorial English docs.python.org

   The official Python tutorial.

   For: General public

8. Automate the Boring Stuff with Python English automatetheboringstuff.com

   Free book: practical Python for everyday tasks.

   For: General public

9. JavaScript.info English javascript.info

   Modern, thorough JavaScript tutorial.

   For: General public

10. Eloquent JavaScript English eloquentjavascript.net

    Classic JavaScript book, free online.

    For: General public

11. Pro Git English git-scm.com

    The official Git book.

    For: General public

12. The Missing Semester (MIT) English missing.csail.mit.edu

    Shell, editors, Git and other essential tools.

    For: General public

13. Open Source Society University English github.com

    A complete, free computer science curriculum.

    For: General public

14. Roadmap.sh English roadmap.sh

    Learning paths for every area of software.

    For: General public

15. Exercism English exercism.org

    Exercises in 60+ languages with mentoring.

    For: General public

16. Codewars English codewars.com

    Coding challenges by level.

    For: General public

17. SQLBolt English sqlbolt.com

    Learn SQL with interactive exercises.

    For: General public

18. VisuAlgo Multilingual visualgo.net

    Visualize data structures and algorithms.

    For: General public

19. Code.org Multilingual code.org

    First steps in programming for all ages.

    For: Elementary schoolMiddle & high school

20. Scratch Multilingual scratch.mit.edu

    MIT’s visual programming for beginners.

    For: Elementary schoolMiddle & high school

21. CS50’s Introduction to Programming with Python English cs50.harvard.edu

    Harvard’s free Python course.

    For: Middle & high schoolCollegeGeneral public

22. Think Python English allendowney.github.io

    Free introductory Python book.

    For: General public

23. Full Stack Open English fullstackopen.com

    University of Helsinki’s web development course.

    For: CollegeGeneral public

24. web.dev – Learn English web.dev

    Google’s free HTML, CSS and accessibility courses.

    For: General public

25. The Rust Programming Language English doc.rust-lang.org

    The official Rust book.

    For: General public

26. A Tour of Go English go.dev

    Interactive introduction to Go.

    For: General public

27. Crafting Interpreters English craftinginterpreters.com

    Build a programming language, free online.

    For: CollegeGeneral public

28. Operating Systems: Three Easy Pieces English pages.cs.wisc.edu

    Free operating systems textbook.

    For: College

29. Open Data Structures English opendatastructures.org

    Free data structures textbook.

    For: College

30. SICP in JavaScript English sourceacademy.org

    The classic SICP, adapted to JavaScript.

    For: College

31. Beej’s Guides English beej.us

    Friendly guides to C, networking and more.

    For: General public

32. Learn X in Y Minutes English learnxinyminutes.com

    Quick tours of dozens of languages.

    For: General public

33. Software Carpentry English software-carpentry.org

    Shell, Git and Python lessons for researchers.

    For: General public

34. Teach Yourself Computer Science English teachyourselfcs.com

    A guide to the best free CS resources.

    For: General public

35. Advent of Code English adventofcode.com

    Yearly programming puzzles.

    For: General public