The central concept of the book is the "Focusing Question," which asks, "What's the ONE thing I can do such that by doing it everything else will be easier or unnecessary?" This question helps you identify your top priority and concentrate your efforts on what truly matters, leading to more significant progress and less wasted time.

Keller and Papasan advocate for the practice of time blocking, where you set aside dedicated periods to work on your most important task without interruptions. This method ensures that you consistently make progress on your key goals and helps build momentum towards achieving them.

The book illustrates how focusing on one key task can create a domino effect, where completing that task makes subsequent tasks easier or even unnecessary. By identifying and tackling your most impactful task first, you can create a chain reaction of positive outcomes that propel you towards your larger goals.