There are three parts to an essay. The introduction, the body, and the conclusion. The introduction is the paragraph in which you tell the reader about what you will be writing the essay on. (Remember, unless it is an opinionated essay, never use terms like: us, we, I, you, and me.)
The body of your essay is the paragraph(s) in which you give all of the details about your topic. If you have more than one paragraph, make each one about a different section of what you should be writing. In those paragraphs, give details, references, quotes, and text evidence of your topic.
In your conclusion, sum up the essay. A summary is a brief explanation on your topic, including everything that you covered in your paragraphs. Make sure you have a good conclusion sentence.
I hope this helped. If you have any more questions, just let me know!