Provides access to courses offered by over 200 universities and companies. The courses themselves are free, but you can pay to earn a course certificate. By paying, you also get access to additional quizzes and projects. On a larger scale, portions of Master’s programs are available as well as full online degrees.
In addition to courses, Guided Projects are available which teach job-relevant skills and industry tools. These start at $9.99 and else result in a certificate. Similarly, professional certificates are available.
Coursera is a great option for self-motivated learning. It is not necessarily a useful tool for reference or review, though. Based on the 4-6 week timeline for courses, one could use Coursera over breaks for personal enrichment.