This document provides instructions on how to write a well-structured paragraph. It defines a paragraph as a group of sentences focused on one subject. It then gives an example paragraph about a girl and her dog, and explains that a paragraph stays on one topic while non-paragraphs cover unrelated topics. The three key parts of a paragraph are identified as the topic sentence, supporting details, and concluding sentence. Guidance is provided on how to write an effective topic sentence and include supporting details with examples. The document concludes by giving a full example paragraph that incorporates all the discussed elements.