Ever heard of Udemy?
This website created in 2010 became a massive online phenomenon
for eLearning. On Udemy anyone can upload a course, sell it to other users of
give it for free. Prices range from 0 to $250. Each course
contains several lessons which can include videos, PFSs, Word documents and
slide presentations. After
taking a course you can rate it and share it on Facebook, to help other users
decide which course to go for.
Obviously I
was looking for something more stimulating than "How to Meditate Deeply
& Create a Solid Daily Practice", so here is a 18-lecture course on aerospace engineering.
[Udemy website]
