1. Raschka et al, pages 175-192
2. Hastie et al Chapter 7, here we recommend 7.1-7.5 and 7.10 (cross-validation) and 7.11 (bootstrap). See https://link.springer.com/book/10.1007/978-0-387-84858-7.
3. Video on bias-variance tradeoff
4. Video on Bootstrapping
5. Video on cross validation

For the lab session, the following video on cross validation (from 2024), could be helpful, see https://www.youtube.com/watch?v=T9jjWsmsd1o