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TL;DR: A wide range of online courses from Harvard University are available to take for free on edX.

This introductory course, designed by David J. Malan, is a global phenomenon. CS50's Introduction to Computer Science tackles the fundamentals of programming using C, Python, JavaScript, and SQL.

edX hosts a wide range of free online courses from from the likes of Harvard, Stanford, and MIT. Those are some big names, ...