I watched fuckton of applied science and cody's lab but their content is too slow to recommend in general I think.

3blue1brown is decent but I found a better one for the abstract stuff
https://www.youtube.com/watch?v=wrwgIjBUYVc&ab_channel=ScienceClicEnglish

something like practical engineering seems to be the most generally recommendable channel I think. And even then he pads his videos a bit.