11.1. What is regularization?11.2. What is ridge regression?11.3. What is the L2 norm, and how does ridge regression use it?11.4. What is the L1 norm, and how does LASSO use it?11.5. What is elastic net?11.6. Building your first ridge, LASSO, and elastic net models11.7. Benchmarking ridge, LASSO, elastic net, and OLS against each other11.8. Strengths and weaknesses of ridge, LASSO, and elastic netSummarySolutions to exercises