This document discusses the basic components of writing, including sentences, paragraphs, and essays. It defines a paragraph as a basic unit of organization consisting of related sentences that develop one main idea. The document provides guidance on how to structure a paragraph, including using a topic sentence to introduce the main idea, supporting sentences to provide details and examples, and a concluding sentence to restate the main idea. It also gives tips for writing coherent paragraphs, such as proofreading, editing, using transitional phrases, and staying focused on one main idea. Finally, it discusses the importance of unity and coherence in paragraphs.