"The Best Yes" is a book by Lysa TerKeurst that focuses on the importance of making wise decisions in life. It emphasizes the need to prioritize commitments and understand the impact of saying "yes" to certain opportunities while learning to say "no" to others. The book provides practical advice on how to discern the best choices that align with personal values and goals. Through relatable stories and biblical principles, TerKeurst encourages readers to evaluate their time and energy. By doing so, individuals can avoid overwhelm and live a more fulfilling life, ultimately leading to better relationships and personal satisfaction.