Not just YouTube. MIT has an open course system that is available to anyone, for free, from actually employed MIT professors, lecturing real courses [1]. I went to a state university that basically copied Pearson slides and books into a course with minimal adjustments.

Rather than sitting through a 50 minute lecture, I found a similar lecture on the same topic (c debugging, I think it was), and pointed out that the MIT instructor covered the same topic, in more depth, in real-time, with a live demo, in overall less time than it took the State University professor to explain. It was concise, wasted no time, and gave me clear information on what I needed to know with minimal extra examples.

And my course instructor hated me pointing that out.

[1]: https://ocw.mit.edu/