If you want to learn new computer skills, check out our list of free online computer courses with certificates to explore web design, Python, AI and more.

If you're interested in learning an in-demand skill, consider enrolling in a course on coding. Harvard University offers five free courses in computer science designed for beginners.

In 2011, trawling YouTube for other course material, Guimaraes clicked on a lecture from Harvard’s introductory computer-science class, CS50, which was taught by a young professor named David Malan.