The document discusses summarizing as an essential skill that involves condensing large amounts of information from texts into shorter versions that capture the main ideas. It provides steps for summarizing written texts, which include reading carefully to understand the main points, underlining key words, writing notes, combining ideas into sentences while maintaining the overall meaning, and checking against the original text. The characteristics of a good summary are also outlined, such as being shorter than the original, focusing only on the main ideas without examples or opinions, and properly attributing the source.