[nyrikki]

Depends on how much of the work you do yourself.

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.

But practice is required IMHO.

[xanderlewis]

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.