[OracB7]

Eugenia Cheng has some interesting and accessible videos, e.g.:

https://www.youtube.com/watch?v=ho7oagHeqNc

and in a similar vein I am enjoying her book: "How to Bake Pi".

Getting more into the technical side of things, Bartosz Milewski has good lessons in this playlist:

https://www.youtube.com/watch?v=I8LbkfSSR58&list=PLbgaMIhjbm...