This document provides guidance on effective camera techniques, editing, sound, and mise-en-scene elements for a horror film trailer. It recommends using extreme close-ups, establishing shots, distorted angles, and tracking shots to create mystery. Quick cuts and a lack of resolution are suggested to maintain suspense. Both diegetic and non-diegetic sounds should be used to build tension. Low-key lighting, isolated locations, and symbolic props and costumes can further disorient viewers and hint at danger, leaving them wanting more information.