The first step in writing a good essay is making sure you completely understand the question posed in your essay topic.
Begin researching your topic. Go to your local library to find publications related to your topic and also search the Internet for additional information.
Once you collect enough material to begin, you should plan your essay. Think about how to assemble all the information you have collected including your your own ideas and interpretations.
Always write multiple drafts and make sure your ideas flow from one argument to the next. Never plagiarize! Always keep track of any quotes or citations and include them in footnotes and bibliography. Remember that universities often use computer software that can turn-up plagiarism.