"Start with Why" by Simon Sinek is a book that explores the concept of using a company's purpose, or "why," as the foundation for successful leadership and business strategy. The book is organized around the idea that successful companies and leaders start with their purpose and use it to inspire and guide decision-making, while less successful companies and leaders focus on what they do or how they do it.

1. "The Golden Circle": Sinek introduces the concept of the Golden Circle, a framework for understanding how successful companies and leaders communicate their purpose. He argues that successful companies and leaders start with their "why" (purpose), then explain "how" they fulfill that purpose, and finally, describe "what" they do.

2. "Why: The Purpose": Sinek explores the concept of a company's "why," or purpose, and how it can be used as the foundation for successful leadership and business strategy. He provides examples of companies that have successfully used their purpose to inspire and guide decision-making, such as Apple, Martin Luther King Jr, and the Wright brothers.

3. "Leadership and Inspiration": Sinek explains how a company's purpose can be used to inspire and guide leadership decisions, and how leaders can use their purpose to inspire and motivate their teams. He provides examples of leaders who have successfully used their purpose to inspire and guide their decisions, such as Martin Luther King Jr, and the Wright brothers.

4. "Communicating the Why": Sinek provides strategies for effectively communicating a company's purpose to customers, employees, and other stakeholders. He covers how to use storytelling, symbolism, and other techniques to communicate the "why" in a way that resonates with people.

5. "Putting it into practice": Sinek provides practical advice for putting the ideas from the book into practice. He covers how to find and articulate your company's purpose, how to use it to inspire and guide decision-making, and how to effectively communicate it to customers, employees, and other stakeholders.

Overall, "Start with Why" provides a compelling argument for using a company's purpose as the foundation for successful leadership and business strategy. Sinek provides a clear framework for understanding how successful companies and leaders communicate their purpose, and provides practical advice for putting the ideas from the book into practice. He covers how to find and articulate your company's purpose, how to use it to inspire and guide decision-making, and how to effectively communicate it to customers, employees, and other stakeholders.