Stop focusing on MOOCs and youtube videos and study textbooks. Do exercises. Treat it like academic studying, and you'll end up with a decent education. It's important, because it's often easier to make a thing work okay than to understand why it works, so you'll get false confidence working through a tutorial. But then you want to apply that to something else and it doesn't work quite right, you won't know why it doesn't work and how to fix it.

Get some textbook suggestions and make a minimum of reading 5-10 pages per day. In about a month or two, you're done with a 300 page book. Repeat that for a few years and you're an expert. Once you have the foundations, read papers too, but don't skip straight trying to using AlphaZero to solve a curve fitting problem.