<p>CS50x is Harvard's flagship introductory computer science course, taught by Professor David Malan and delivered fully online at no cost. It covers computational thinking, abstraction, algorithms, data structures, resource management, software engineering, and web development across seven programming languages.</p> <ul> <li>Open to all; no prior experience required</li> <li>Languages covered: C, Python, SQL, HTML, CSS, and JavaScript</li> <li>Ten problem sets plus a final project that students may implement in any language</li> <li>Earn at least 70% on each problem set, lab, and the final project to qualify for the certificate</li> <li>Free Harvard CS50 Certificate issued directly on completion; a paid verified edX certificate is optional</li> <li>Self-paced with a suggested eleven-week schedule at roughly 10–20 hours per week</li> </ul> <p>Enroll and start any time via the CS50 platform — all lectures, problem sets, and grading are accessible without payment.</p>