H
Harvard Online
Programming Languages
CS50x: Introduction to Computer Science
Harvard's legendary introduction to computer science and the art of programming.
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University · United States
Harvard Online
Harvard's open catalogue, including CS50.
2 courses indexedPaid certificates4.9 ratingSince 1636
Harvard publishes a large free catalogue through its Online Learning portal and edX, headlined by CS50 — the introduction to computer science used by hundreds of thousands of learners each year. All course material, lectures and problem sets are free; only the verified certificate carries a fee.
University-grade materialCS50 ecosystemLifetime access to contentStrong community
Certificates
Courses are free to audit; a verified certificate is optional and paid.
Best for
Learners who want rigorous, university-level foundations rather than a quick tutorial.