Getting Things Done: The Art of Stress-Free Productivity is a book by David Allen that teaches readers how to become more productive and organized. It outlines a system for managing tasks and responsibilities, and emphasizes the importance of breaking down large projects into smaller, achievable goals. The book also introduces the concept of the "two-minute rule," which encourages readers to take care of tasks that can be completed in two minutes or less, rather than procrastinating or putting them off. Ultimately, the book aims to help readers reduce stress and increase productivity by developing a system for managing their tasks and responsibilities.