Which sentence of a paragraph is often the main topic sentence?

The first sentence in a paragraph is often the main topic sentence because it introduces the primary idea or focus of the paragraph. By placing the topic sentence at the beginning, the author sets the stage for the details and examples that will follow, guiding the reader on what to expect. This organization is a conventional approach in writing, helping to create clarity and coherence in the text. The topic sentence essentially provides a roadmap, allowing readers to grasp the central theme right away, which aids in the overall understanding of the paragraph.