This document provides an overview of Acceptance and Commitment Therapy (ACT). It begins by outlining some common misconceptions people have about happiness. It then explains that ACT focuses on psychological flexibility rather than trying to control thoughts and feelings. The core principles of ACT - diffusion, expansion, connection, the observing self, values, and committed action - are meant to increase mindfulness and values-guided action. Techniques like diffusion, expansion, and urge surfing are presented to help cope with difficult thoughts, emotions, and urges in a way that moves one's life in a meaningful direction.