*Mastery* by Robert Greene is a self-help and personal development book that explores the principles and strategies for achieving mastery in any field. Greene examines the lives and careers of historical and contemporary figures who have reached the pinnacle of their disciplines, identifying key elements that contributed to their success. The book provides practical advice on developing skills, overcoming obstacles, and pursuing excellence, offering a roadmap for readers to achieve their own goals and attain mastery in their chosen areas.