That said, I do credit part of my education to Youtube University. I learned more about virology in details that I never thought about before. Still, I haven't yet complete the virology lectures.
Finding and signing up for a class or lessons is a big, expensive hurdle, and then you might discover you hate the subject or the teacher. If you can quickly and easily dip into a dozen subjects and try videos from hundreds of creators, you can rapidly try and reject things until you find one that strikes you and stick with it.
The Internet in general does this, but YouTube is a big part of it, especially things where visuals are useful—woodworking is a good example, but there are so so many things to learn if you can jut find a subject and a teacher that catches your interest.
For example, Robert Sapolsky's lecture series on Human Behavioral Biology at Stanford: https://www.youtube.com/watch?v=NNnIGh9g6fA&list=PL848F2368C...
Stanford and MIT both have lots of lectures on YouTube.