Such a great book with simple words and the concepts easy to understand. This book is based on 4 rules that form a habit loop. Cue, craving, response and reward. The interest is given to even to a small habit that we neglect as we feel it common. Not only did he explain on how to start a good habit, but also, explained how to stop a bad habit. The inverse of the 4 laws is also given. The habit chart, habit tracker and few more are all a great ideas. The book throws light on habit stacking, habit bundling and many more useful tips. Ultimately, a complete package on building good habits and breaking the bad ones.