The document outlines 8 common "sins of writing dialogue" that authors should avoid, including: writing how people really talk instead of using dialogue to reveal character and move the story forward; failing to give characters individual speech traits; including long speeches instead of the message coming across the entire story; using heavy dialects or accents; excessive bad language; including exposition in dialogue; dialogue that is too direct and "on the nose"; and failing to listen to real people talk to understand different speech patterns. The document provides examples to illustrate good and bad dialogue and tips for distinguishing characters through their speech.