Annie Duke's "Thinking in Bets" uses poker to teach readers how to make better decisions in life. The book argues that uncertainty is a constant in decision-making, and that recognizing this uncertainty allows for better outcomes. Duke introduces the concept of "resulting," which is the tendency to equate the quality of a decision with the quality of its outcome. She also discusses the importance of recognizing and overcoming biases, such as the self-serving bias and motivated reasoning. She emphasizes that good decision-making involves understanding the different factors influencing an outcome and considering a variety of possibilities, while also acknowledging the role of luck.