What exactly is a thesis statement?

The thesis statement states the thesis or argument of the author in an essay or similar document. Usually no more than a sentence or two long, it is a focused section of text that clearly delineates the argument that is presented in the work and is usually found at the end of the first paragraph of a paper. The thesis statement says what the author or authors are trying to prove in the document. The subject of the thesis statement reflects the topic of the paper and the predicate is usually what the author of the paper is trying to prove. The thesis statement is invaluable when constructing an outline, as it shows what points need to be proven. A thesis statement is usually restated in a closing paragraph, if in a formal essay, containing a slightly varied format and using synonyms as to not make a passive statement. A thesis statement could be described as a 'topic sentence of the topic sentences (in the essay)' or an 'outine of the outline(in an essay or similar document)' because it can be the most important part of the opening section or paragraph in an essay or similar document.

a thesis tells the reader what your paper is going to be about, so maybe pick three main topics and put them on a sentence