[pengaru]

The 3b1b videos are really high quality, but I don't find them particularly useful when learning new material. The fancy animations distract and mesmerize, I slip into a mode of being entertained, becoming mostly a waste of time.

For subjects I've already learned however they can be useful for gaining new visual perspectives.

On the topic of learning rotation matrices / linear algebra in video games, I'd strongly recommend the Handmade Hero youtube channel. Casey explains these subjects at length in multiple videos, using plain chalkboard-style drawings I personally find far less distracting.

[AlchemistCamp]

They give the "feeling of learning", which is worth only a little. They also give the motivation to learn, which is invaluable.

[bananaface]

Second on Handmade Hero. It's great.