Very nice "visual" introduction a topic that's usually treated very abstractly in math textbooks! If you'd like more of such a visual perspective on differential geometry, I recommend Tristan Needham's book [1].
Math is like skiing or playing the guitar, you don't get better by watching others do it.
Personally I find videos useful to augment books, but rarely a substitute for them. But I am bad about pausing, ruminating and practicing, you may be more successful than I.
Well... there are some things one can get better at by watching — chess, for example. However, of course, you're right: in mathematics (and probably chess?) 90% of the learning has to be done yourself.
https://www.youtube.com/watch?v=mKtctCyd0rs&list=PLWEiAJhCw-...