Through the power of cinema, audiences have long been treated to some of the best stories in fiction, through a diverse range of genres each dedicated to their tropes and themes. These movies follow a traditional structure of beginning, middle, and end, with each part playing a key role in determining how the story is perceived by audiences. For most stories, the opening sequence can be the make or break for how invested audiences get in the story.
Source:https://www.cbr.com/movies-opening-scene-set-up/