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.