edx

Computer Science Courses

Edx is a nonprofit, open-source educational platform that was founded by Harvard and MIT. You can find a wide range of computer science courses here, from mobile development to machine learning. All of the material is on-demand. 

The quality of the lectures is top-notch, and they also provide challenging homework assignments. If you want to earn a certificate and take tests then you need to pay around $50-70, but they also have a free version. 

This resource is especially good for those who want to learn Python! You can’t go wrong with classes from such well-respected universities.