Comprehending the subject. This is the one of the most important thing to remember while penning an essay. What is the subject matter? What should be the essay all about? These questions should have a ready answer with the author, who is about to write an essay. Without properly understanding and comprehending the subject, nobody can even write a sentence within an essay. Before starting with the essay, the subject matter should be carefully studied upon, and self-conclusions regarding the topic should be present in the mind. Once this is over, you can safely assume that half job has been completed.