Unlike other student papers, does not have clear content requirements. Usually everything depends on the topic and the subject. Of course, it is impossible to say that there are no definite criteria for evaluation, so some requirements must be met. The content of the text is reflected in its structure.
The structure of essays of this type is classic: introduction, main part, conclusion. This structure corresponds to the logic. So in the introduction introduce the reader to the problem that you're going to think about, introduce him to the case.
In the main part you have to indicate his idea and to support it with two or three arguments. You can stop there and move on to the conclusion. But to make the essay look professionally done, you need to add one more part: the counter-opinion.
A counter-opinion is an idea that is the opposite of the one you argued before. It shows that you are well-informed and that you know your way around the problem. The counter-opinion must also be supported by arguments. After this you must explain why this opinion is wrong. And only after that is the logical conclusion of the reasoning.
With the knowledge of how to write an essay correctly, you will be able to avoid common mistakes and create an interesting and persuasive paper. It's easy enough to find essay writing samples on the Internet, but you should keep in mind that not all freely available papers are done to a high standard. Remain critical of the writings of anonymous authors.