Getting off a topic a lot with trying to explain your details and evidence will prevent you from being able to get back on track with your main reasons and keep your readers attention on what you are trying to talk about.
To write a good essay it is important to organize your ideas. The first step is to develop a thesis, the second one, is outline your essay and finally, check the coherence, grammar and spelling of each paragraph.
A good tip is to keep your writing simple and clear and try to select only the most important arguments to support your thesis.
