For those of you new to 3blue1brown, it is a YouTube channel about math.  Many videos are about some interesting one-off topic, outside what one would typically see in a school setting, meant to show how beautiful math can be.  For examples of that, check out the "recommended" playlist.

I also make series about about topics which people commonly need to learn, distilling down to the essence of each, focussing on geometric intuitions.  Take a look at the series on linear algebra and calculus.