Overfitting vs Underfitting Clearly Explained with a Desmos Example

From a channel Lumen includes in full: Mihai Nica, a probability professor, posts rigorous lectures and explainers on probability and reinforcement learning, including a multi-part breakdown of how AlphaZero works.

A 32-minute video from Prof Mihai Nica's catalogue; the title names its topic.

Video by Prof Mihai Nica, played through YouTube's embedded player.