To write a thesis statement of an essay, make sure the thesis serves as an introduction to the rest of the essay and that the content of the thesis contains an argument that is not considered a statement of fact. A statement of fact is a statement that is indisputable and therefore goes against the purpose of the thesis.
Before writing a thesis, determine the type of essay that is being written. There are three major types of essays that require a thesis statement: analytical, expository and argumentative. An analytical paper dissects and evaluates an issue and puts forward a detailed analysis and evaluation to the audience. An expository or explanatory paper explains an idea to an audience, while an argumentative paper presents a claim or argument and proves the claim accurate by providing evidences to justify it with the goal being to convince the audience that the claim is true.
After determining the type of essay, make sure the thesis specifically and exclusively discusses the topic of the paper with the intention of providing supporting evidence to back it up. The thesis statement must be placed in the introduction of the essay and typically appears at the end of the first paragraph. While writing, ensure that the essay stays on topic with the thesis. If there are slight contradictions, make necessary changes to the thesis to ensure the consistency of the written topic.