The Beginning of Things tells you Stuff: Determining Genre
Pay careful attention to the opening section of any discourse. The first five minutes of a movie, the first chapter or so of a novel, the opening introduction of a sermon, the first paragraph of a newspaper article—all of these “first moments” are specifically designed to orient you to the thing that you are reading or hearing or watching. Remember, authors generally want to be understood, and because they want to be understood they want to set you up to read well.