Learning a new skill or topic online is easier than ever. For some professions you still need degrees, but with the amount of high-quality knowledge available out there it’s becoming less and less of a necessity.
Universities like the [MIT] or [Stanford] usually release full videos of most courses on youtube for free.
The list that follows mostly focuses on programming, but you are going to find courses on a large variety of disciplines and topics if you take a look.
Some examples from Stanford:
From Khan Academy:
For more coding courses check out: