Writing an introduction for an essay is -I think- the most important and at the same time difficult part in the process; since it provides a general picture of what the whole essay is all about.
There are a number of ways to learn how to write an introduction for an essay but the best piece of advice in helping you create the ideal introduction is to understand the function of the introduction. It exists to introduce the reader to the topic. Imagine it is like one person introducing two people who do not know each other. You, the writer, have created an essay. The reader of the essay, possibly your tutor or professor, has not seen this piece of prose beforehand. It is all new to them. You are the one conducting the introduction.
How to Write an Introduction for an Essay
When writing an introduction for an essay, there are many things that will help you succeed, but none of them is more central than your opening sentence. Opening sentences are so important because they are going to be the first thing your reader sees when they start to read your paper, so it has to do several things. First, it must grab their attention, as a boring opening sentence is often followed by a boring paper. It must also communicate a bit about what the paper is going to be about, because part of good writing is being succinct, so you need to be more than just attention grabbing, there is also information that must be communicated.