Atomic Habits explains how small habits can have a tremendous impact on our lives over time. It argues we should focus on building good habits through a system of "tiny habits" rather than obsess over goals. The book provides tips for developing habits, including making new habits obvious with a specific plan, starting small and simple, performing the habit at the same time each day, and linking new habits to existing routines. By following these principles of habit formation, readers can change their habits and ultimately change their lives.