1. Unity: The essay should be about one main idea or topic, and all of the paragraphs should support this main idea.
2. Structure: The essay should have a clear structure, with an introduction, body paragraphs, and a conclusion.
3. Paragraphs: Each paragraph should have one main point, and the sentences in the paragraph should support the main point.
4. Transitions: Transitions are words and phrases that connect paragraphs and sentences, and help the reader to follow the logical progression of the essay.
5. Evidence: The essay should be supported by evidence, such as facts, examples, and quotes.
6. Analysis: The essay should not just restate the evidence, but also analyze it and explain how it supports the main idea.
7. Style: The essay should be written in a clear and concise style, and should avoid using jargon and slang.
8. Title: The essay should have a title that accurately reflects the content of the essay.
9. Word limit: Many assignments will specify a maximum word limit, and students must make sure that their essay does not exceed this limit.