The Success Principles book summarizes timeless success principles used by successful individuals throughout history. It covers principles for career, family, finances, health, spirituality, and more. The book provides 64 life-changing principles for the reader to apply, such as taking responsibility for one's life, defining goals and purpose, committing to self-improvement, and starting immediately. Applying these principles through actions like goal-setting, asking others for advice, and focusing on progress can help the reader achieve their dreams.