3Blue1Brown
Linear algebra, calculus and neural networks made visual. Probably the best there is at this.
Channels worth your time
What I tell students to watch when they want the intuition rather than the notation.
A distribution moving on screen does more for intuition than three pages of notation, and the people below are very good at it. I send students to them regularly.
It is a short list, and everything on it is something I actually watch.
Recommended
The two I point students to first. Between them they cover a lot of the intuition that textbooks assume you already have.
Linear algebra, calculus and neural networks made visual. Probably the best there is at this.
Statistics and machine learning explained slowly and without hand-waving. Excellent before an exam, and honestly after one too.
Mine
The odd ones out on this page, since I am the one making them. One is a hobby with nothing to do with the research. The other covers exactly what I work on, in plain language and without the notation.
Myths and legends from around the world, retold as animated short films. A hobby, with nothing to do with the research, and that is rather the point.
Expect a simplified overview of AI, of insurance, and of the ground where the two meet: the same subjects as the research and the teaching, without the notation. Newly started, one video so far.
If you know a channel that belongs on this list, send it to me. I am trying to keep it short rather than complete, but I am always happy to find something new.