My favorites are the micrograd series by Andrej Karpathy on youtube [0], and “Why Deep Learning Works Unreasonably Well” [1]

The greats on youtube are also worth watching: 3B1B, numberphile, etc.

[0] https://youtube.com/playlist?list=PLAqhIrjkxbuWI23v9cThsA9Gv... [1] https://youtu.be/qx7hirqgfuU?si=8zmrbazuvnz379gk