Congratulations, you're a manager! After you pop the champagne, accept the shiny new title, and step into this thrilling next chapter of your career, the truth descends like a fog: you don't really know what you're doing. That's exactly how Julie Zhuo felt when she became a rookie manager at the age of 25. She stared at a long list of logistics--from hiring to firing, from meeting to messaging, from planning to pitching--and faced a thousand questions and uncertainties. How was she supposed to spin teamwork into value? How could she be a good steward of her reports' careers? What was the secret to leading with confidence in new and unexpected situations? Now, having managed dozens of teams spanning tens to hundreds of people, Julie knows the most important lesson of all: great managers are made, not born. If you care enough to be reading this, then you care enough to be a great manager.