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.
This is one of the most important aspects of essay writing. You can write a brilliant essay, but will get very low marks and probably fail your assignment if you have not answered the question which was asked. So before you put pen to paper make sure you have interpreted the title correctly. If you are asked to choose your own essay title, it is a good idea to check with your tutor that it is suitable.