To write a proper thesis statement, clearly express the main point or argument of your paper in one to two sentences. It should be specific, debatable, and concise, reflecting the focus of your research or argument. Place it at the end of the introduction, guiding the reader on what to expect. Avoid vague language, and ensure it directly answers a research question or addresses a topic. Revise as necessary to align with your paper’s content as you develop your ideas further.