Quick Answer. The subtopic of an essay is a topic that supports the main topic of the essay and helps to bolster its credibility. An example of a subtopic in an essay about transitioning to a new school might be difficulty making new friends or learning what each teacher expects..How do you write the perfect 5 paragraph essay? 1st paragraph - Introduction: provide evidence and examples to support the subtopics in your body paragraphs..The introduction paragraph has a statement of the topic of the essay and a preview of the subtopics of the main topic. Ideally, a multi-paragraph essay should include at least three subtopics. The introduction paragraph should begin with a hook that makes the reader interested in the topic of the essay..The primary purpose of an introductory paragraph is to pique the interest of your reader and identify the "Examples of Great Introductory Paragraphs .