If you mean something like a blog/channel/streaming service by the word 'school' then I'd say written chapters are the way to go for me. Because videos are not that much of in-depth companion to anything. A well-written book can answer almost all of your questions. But books get outdated too soon. So if it's like a blog, it's easy to keep everything up-to-date. So, yeah, if I find well written posts/chapters anywhere, I sit back and read. This works for me as I am not that much of a visual learner.
This is the main reason I came back on the forum. Lots of quality posts/guides to read.