Coursera is currently the most popular online learning platform around the world with over 33 million registered users and over 2,400 courses. It was founded by Stanford professors and most of its courses are taught by top professors from elite universities. Coursera offers degrees, professional certificates, and individual courses on a wide variety of subjects. You can take courses for free (without the possibility of doing assignments, taking tests, or earning a certificate) or pay for a course or degree. Individual courses typically cost around $50 per course, and degree programs cost substantially more but are much cheaper than on-campus degrees at most universities. Get started with Coursera today!