<p>CS50x is Harvard University's free, self-paced introduction to computer science and the art of programming, taught by David J. Malan and delivered on edX through HarvardX. It covers algorithmic thinking and fundamental computing concepts, using C, Python, SQL, JavaScript, CSS, and HTML.</p><ul><li>Introductory level; no prior programming experience required.</li><li>Around 12 weeks of material at 6–18 hours per week, entirely self-paced.</li><li>Topics include abstraction, algorithms, data structures, security, software engineering, and web development.</li><li>Nine problem sets plus a final programming project; learners who pass earn a free HarvardX certificate.</li><li>Paid verified edX certificate available as an optional upgrade.</li></ul><p>Enrolment is rolling — register any time on edX and progress on your own schedule.</p>