The document discusses the importance of opening sequences in films. An opening sequence aims to be 2-3 minutes and captures the audience's interest by introducing main characters, setting, narrative, genre, and theme. It also establishes the visual style of the film. Main characters are usually featured to give the audience insight into their personality and role. Additionally, the first 10 shots are crucial for making a strong first impression on the audience and keeping their attention to watch the full film.