This text introduces the "Let Them Theory," a self-help concept advocating for relinquishing control over others' actions and opinions. The author details a personal anecdote about her son's prom to illustrate the theory's transformative power, highlighting the stress caused by attempting to control external factors. The core principle is to focus energy on oneself ("Let Me") rather than expending it on fruitless attempts to manage others ("Let Them"). This shift, the author claims, leads to increased personal power, improved relationships, and a more fulfilling life. The theory's widespread popularity, including social media virality and even tattoos, is also highlighted. Finally, the author promises to explore the scientific backing and practical applications of the theory in subsequent chapters.