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. Most of these courses are only available in English.
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 the time to look.
Some examples from Stanford University:
From Khan Academy:
For more courses specifically tailored towards coding straight up check out: