1. Introduce the main idea of the paragraph. It should be a general statement that gives the reader an overview of what the paragraph is about.
2. Be specific and focused. It should not be too broad or general, but should give the reader a clear idea of what to expect in the paragraph.
3. Be arguable. It should not be a statement of fact, but should present an opinion or argument that can be supported by evidence.
4. Be relevant to the essay's thesis statement. It should support or develop the main argument of the essay.
5. Be engaging. It should grab the reader's attention and make them want to read more.