From entrepreneur Raffi Grinberg, who lived and learned the hard way throughout his twenties, here is a crash course in everything you need to know to be a grown up. Based on his wildly popular “Adulting 101” course at Boston College, Grinberg firmly steers you through the basics of being a grown up using interactive chapters, bite-size nuggets of wisdom, humor, and stories from his twenties, including nearly going broke, having bad credit, disappointing his parents, and much more.