I second this, with emphasis. His videos cover the vast majority of topics at the intersection of math and hn. He has written custom software for the creation of the animations.
I'd love to filter the internet by "content that can give you insights right now that would otherwise take years of study in a specific discipline to even know exists".
A quick google for "3blue1brown awesome github" (my usual strategy for finding good similar content) landed me here: https://github.com/rossant/awesome-math
The awesome lists are pretty good starting points for finding good content, but there's a ton of them of variable quality, so you end up with stuff like this: https://github.com/jonatasbaldin/awesome-awesome-awesome (which has 68 forks...)
The video on L'Hopital's rule, and the one on Fourier transform, helped me intuitively understand those topics for the very first time ever. And I'm years out of school and have no need to use those concepts in work again, yet I watched them just to understand what was always a mystery to me in class at the time.
It’s on another level imo.