Chapter 4 - Habit Audit: Identify current habits (good and bad) to determine which to build or break; many habits are subconscious and automatic.
Chapter 5 - Implementation Strategies: Specify when and where habits will occur (e.g., "I will work out at 9am Monday-Friday for 30 minutes"). Use habit stacking by linking new habits to existing automatic behaviors (e.g., "After I brush my teeth, I will meditate for two minutes").
Chapter 6 - Environment Design: Make environment support desired habits; context is the cue, not just single triggers (e.g. Put a book on your pillow in the morning if you want to read at night).
Chapter 7 - Breaking Bad Habits: Make bad habits invisible by reducing exposure to cues that trigger cravings (e.g. if you can't get your work done, put your phone in another room, if you are spending too much money on electronics quit reading reviews of the latest tech).