The Financial Diet, authored by Chelsea Fagan, is a beginner-friendly guide that helps individuals develop healthy financial habits. While not specifically focused on business budgeting, this book offers valuable insights on personal finance management, which can be applied to business finances as well. Fagan provides practical advice on budgeting, saving, and investing, helping you gain control over your financial situation. By mastering personal finance, you can develop a solid foundation for managing your business budget effectively.