1) Structure is important for storytelling as it communicates events to the audience in an organized way. Most films follow a three-act structure with an introduction, rising action/conflict, and resolution.
2) Short films similarly follow the three-act structure but must establish characters and settings immediately without long title sequences due to their shorter time frame.
3) Narratives also follow models like Todorov's five stages that move from equilibrium to climax and resolution, or Campbell's hero's journey with departure, initiation and return acts.