Julie Zhuo, Facebook’s VP of product design, started at the company as its first intern and became a manager at the age of 25. Like many first-time bosses, she made many missteps and acted how she thought managers were supposed to act. Eventually, she grew to find joy in the role and today she leads hundreds of people. She says that becoming a great manager also helps you know yourself better. Zhuo is the author of the book "The Making of a Manager: What to Do When Everyone Looks to You."