The document discusses several key conventions used in film opening sequences. It explains that openings aim to engage audiences and signal the genre through visual and auditory cues. This includes establishing mood through music, lighting, and setting. Openings also introduce protagonists and antagonists and provide credits for important crew and talent to draw in viewers. Narrative techniques like enigma codes that pose unanswered questions and action codes showing events that propel the plot are used to hook audiences into continuing to watch. Elements like titles, logos, and typography work to brand and promote the film.