The document discusses 4 types of meaningful homework and effective study skills:
1. Pre-learning - determining what a student already knows and can do, and identifying ways to prepare for new content.
2. Checking for understanding - activities like explaining concepts back, creating mnemonics, and identifying examples vs. non-examples.
3. Practice and application - completing quality learning tasks and engaging in "strength training" with easier to more difficult problems.
4. Processing and reflection - summarizing content, asking questions from answers, and reviewing material in multiple ways like reading, listening, drawing, and teaching others.