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Online learning is a great way to explore your interests or gain new skills for free, even if you want to attend a Yale lecture or take a University of Michigan course.

You can take online courses from accredited universities on e-learning platforms. You can add optional paid certificates of completion to your resume if you choose to do so.

To narrow down all the free options, we listed the most popular online classes from the top 21 universities, as ranked by US News.

The University of California, Los Angeles and the University of California, San Francisco were not included because they don't offer online classes.