"Learn something new, get trained!" may be the best advice that can be given to any person who wants a better life.
The Internet has made information available on an entirely new level. I appreciate resources like Wikipedia or Stackoverflow for finding quick answers, but I think systematic training that lays a solid foundation is necessary for lasting success.
In this article I am presenting the best online resources for courses that I know of. Even top universities like Stanford offer lectures for free to anybody. Many of the sites will issue a certificate upon successful course completion, a nice acknowledgment.
Some sites are also a public platform for teachers, so you can make money by passing on your knowledge.
The websites below are simply ordered by their popularity (mid 2017).
I am looking forward to comments and additions. Especially if you know of good websites for courses in other languages.
Start using these resources today for a happier life!
materials from 2400 courses of one of the world's leading universities
free, no enrollment or registration
translated courses available (Chinese, Spanish, Portuguese, Persian, Turkish, Korean)
naturally the MIT's main emphasis is on technology, but there are also lectures from departments like "Anthropology", "Global Studies and Languages", "Literature" or "Music and Theater Arts"
high level courses of one of the world's most famous universities
free access to a lot of material
Limitations
courses may require purchase of textbooks
Stanford's offerings are diverse, from free courses to paid post-graduate (bachelor's degree is prerequisite), may take some searching around (see alternative links under tips)
