The Topic Sentence and the Thesis Statement
Both involve main ideas.
A topic sentence contains the main idea of a paragraph.
A thesis statement contains the main idea of an essay.
In this class, your thesis statement will be the last sentence in your introductory paragraph (your first paragraph). It will contain a plan of development, the two points you want to advance in the body/supporting paragraphs. These points will be mentioned in the same order that you will mention them in the body paragraphs and will have a structure that follows parallelism.
Each body/supporting paragraph will contain a topic sentence, which will be the first sentence in each paragraph.