Anatomy… I don’t know if you can properly learn anatomy online. Med schools have anatomy institutes with prosecutoriums ran by specialized faculty. Students learn with real cadavers. Then they learn pathological anatomy with real patients. You also learn a lot in a tactile way, for example, how big the organs are exactly and in what shape. It’s very difficult to learn anatomy to a functional degree with just slides.

I think a curious kid would pick up something from an online tutorial, but they would also pick up some misconceptions. And they’d lose out on the anatomy models and practical kits schools have. I would still see YouTube learning for this kind of discipline as a serious disadvantage.

For example, I could not find one lecture (in about 10 I saw just now searching for “anatomy lecture 1”) that recommends Gray’s Anatomy or similar anatomical atlas books. But they are absolutely foundational, it is the bread and butter of anatomy.

1 hour with a lecturer that would show you around such books and give a 45 minute tactile tour of a model of the human body may do much more than 100 hours of YouTube tutorials. The efficiency of learning just does not compare.