Mel Robbins's The Let Them Theory presents a self-help approach focusing on personal empowerment. The core concept involves accepting what's outside one's control ("Let Them") and focusing on personal actions ("Let Me"). Robbins uses anecdotes and research to illustrate the method's application across various life areas, including relationships, work, and self-improvement. The book emphasizes personal responsibility and emotional maturity, promoting strategies to manage stress and build fulfilling connections. It encourages readers to prioritize their well-being and pursue their goals despite external influences.