“Founded by Harvard University and MIT in 2012, edX is an online learning destination and MOOC provider, offering high-quality courses from the world’s best universities and institutions to learners everywhere.”
Participate in online courses by auditing or earning a certificate. Expand your knowledge in many different fields and learn about something that interests you. They also offer MicroMasters programs. It is free to sign up and audit courses. If you want a certificate, there is a nominal fee.
Go to: https://www.edx.org/