Coursera is a site that collects online educational offerings into one easy-to-use interface. There you can find over 1,000 courses given by 119 higher learning institutions, including Stanford, MIT, Vanderbilt, and Johns Hopkins University. The courses typically feature pre-recorded videos, quizzes, and projects.
It’s important to note that not all courses are free; in fact, only introductory courses typically come without a price tag. And, if you need a formal certificate, it will always cost a little something.