Coursera

Coursera is one of the leading providers of massive open online courses. It has partnered with universities and organizations all over the world to offer universal access to the world’s best education. Some of them include the University of Pennsylvania, Stanford University, University of Michigan, etc.

Coursera has a wide variety of subjects to choose from, anything from data science to musical theory. There are nearly a thousand courses that are completely free. You can click on the category name and you will get a list of free courses from that particular category. The mobile app of Coursera could be downloaded to make learning convenient for you. On completion of some courses, you will be awarded the certificate of completion.