Introduction
You should answer the following 3 questions with your introduction:
1. What is the paper's subject?
Let the reader know what the subject of the paper is.
2. What is the paper trying to prove about the subject?
This is expressed in the thesis statement.
3.How does the paper approach the subject?
Briefly, introduce your main points or the evidence that you will use to prove your point.
Body
Consists of everything between your introduction and conclusion, and it is where you discuss the evidence that you have in support of your thesis statement.
Conclusion
Summarizes the main points you have raised in support of your thesis, reiterating the thesis.
This content is from the University of Portsmouth's Basic Essay Structure.