Start with the Purpose Free pdf book download from here, this is interactive work of Simon Sinek where he expounds on why certain people and organizations succeed or fail. The book presents the “golden circle,” a model comprising three elements: “why,” “how,” and “what.” In Sinek’s view, those leaders who start with the “why” – a basic value or belief – are the ones who succeed. Indeed, this book has played a major role of shifting the perspective through which leadership as well as business strategies are viewed by offering a different approach to how leaders can motivate people. Many opinion leaders in leadership and business have endorsed it, notably Steve Ballmer, the former CEO of Microsoft, and Al Gore, the former vice president of the United States. Sinek has presented what is one of the most popular TED talks of all time, based on the material of the book.