Remember that the introduction denotes the first paragraph of your essay that should be a short paragraph in which you should develop the points related to the subject of your essay. It should make the reader interested in having a further look at your piece of writing. Do not forget that the main body of your essay should contain two or more paragraphs where you should develop all the points related to the subject of your essay. In the conclusion of your essay you are to summarize the major idea of the subject and make general comments to your piece of writing.
Try to make a rough draft of your essay before submission. You must read it aloud and look for any changes if required. If your essay is long or it is a dissertation, you must prepare small drafts of paragraphs and then try to focus on each paragraph. Try to make pointers on these paragraphs, which will help you during the assembly of all paragraphs. Do not lose track of your point or argument. In case if you are lost, refer to points.