This document provides guidance on preparing for and facilitating retrospectives. It outlines the basic structure of a retrospective as setting the stage, gathering data, generating insights, deciding on actions, and closing. It also gives tips for establishing safety, such as using the prime directive and safety checks. Several retrospective styles are described, including four questions, SAMOLO, I Like-I Wish-What If, and goal-driven approaches. Practical tips are provided around using sticky notes, voting, and closing the retrospective. Further references for learning more about retrospectives are also included.