I think anyone starting a lin alg course could do a lot worse than
watch all his "Essence of Linear Algebra" series before starting - then
watch the relevant (c. 15 min) episodes as you take each lecture.
My grades in undergrad would have been so much better if Youtube had existed. Oh well.
One day, when 13 year olds can use VR to meaningfully bootstrap their understanding of differential equations, I’ll probably wish the metaverse was around when I was a kid.