The document provides guidance on how to write a summary. It explains that a summary is a short, concise statement of the main ideas and key details of a reading. To write a good summary, one should include the main idea and most important supporting details while using their own words and being brief. A summary should not include opinions, unessential details, or directly copied text. The document demonstrates how to annotate a text to identify the main idea and key details, map out the information, and then write a summary statement consolidating the essential elements.