As my math advisor said, even subjects like math are best conveyed person to person. There are subconscious and nonverbal communication factors that can’t be reproduced in a video or book.
Sure, I was mostly referring to calculus and the other subjects you study as an undergrad though, where the trade books you can get on Amazon are generally much better than the textbooks that the university courses use.
If that's true then in my four years of college I never experienced those topics in the way that best conveys them.
For subjects like math and CS, these things are great substitutes. For things like mycology or religious studies, less so. I think there is something to be said for using your time in college to focus more on the subjects that are basically unlearnable via other channels.
For things like CS though, just sitting down and spending a weekend watching Tim Roughgarden's YouTube channel will give you more than enough algorithm and data structure knowledge to get a job as a developer or whatever.