There is plenty of scopes to get creative in the introduction of essays. This will ensure that you hook the reader, i.e. draw and keep his attention. So to do so you can start with a quote or a proverb. Sometimes you can even start with a definition. Another interesting strategy to engage with your reader is to start with a question.
This is the main crux of your essays. The body is the meat of your essay sandwiched between the introduction and the conclusion. So the most vital and important content of the essay will be here. This need not be confined to one paragraph. It can extend to two or more paragraphs according to the content.
Usually, we have a lot of information to provide in the body. And the mistakes writers generally make is to go about it in a haphazard manner which leaves the reader confused. So it is important to organize your thoughts and content. Write the information in a systematic flow so that the reader can comprehend. So, for example, you were narrating an incident. The best manner to do this would be to go in a chronological order.