15 Secrets Successful People Know About Time Management offers productivity advice from various high-achievers. 

Kevin Kruse emphasizes prioritizing tasks, using calendars effectively, and overcoming procrastination by understanding its root causes—present bias and a lack of motivation.

He also discusses the importance of setting realistic goals, outsourcing non-essential tasks, and scheduling dedicated time for focused work and rest. He advocates minimizing distractions, improving energy levels through healthy habits, and leveraging tools and techniques to maximize efficiency.

The book concludes by highlighting the need for self-discipline in adopting these strategies.