Depending on the topic of your essay, you may need to do some background research. This could be to find evidence to support your point of view or argument or to find out what people who are experts in the field thing about a particular subject. Or it could be to find scientific or historical facts or statistical data.
Finally, you will write a short conclusion which reminds readers of your main argument and summarizes the way in which you have supported that argument, adding strength to your position. In some essays you will include additional material to the conclusion, for example pointing out areas which still require research or the limits of your own research, but this is something to discuss with your tutor or study skill support staff who are teaching you how to write an essay.