James Altucher's "Side Hustle Bible," which provides a comprehensive guide for those seeking to create additional income streams. It emphasizes the importance of finding a niche, building multiple streams of income, and identifying opportunities in areas where technology is rapidly changing. The excerpt features interviews with a range of successful entrepreneurs and innovators, each sharing their unique experiences and insights into launching and growing businesses in various fields, from online courses to food trucks and even pawnshops. The author provides practical advice on building a personal brand, leveraging existing business models, and identifying opportunities in the ever-evolving gig economy.