The document discusses conventions of form and genre for film trailers and ancillary products such as posters and magazines. It outlines various cinematography, editing, sound, and other technical elements that are commonly used to effectively represent the horror genre and create tension. These include fast pacing, jump cuts, low lighting, ominous music, and the colors black and red. The conventions aim to attract audiences and give a sense of the film's tone and content without revealing too much of the plot.