This document discusses how understanding media conventions has developed over the course of an A-Level Media course. It provides examples of conventions for different genres like horror and thriller films. Specifically for thrillers, it notes conventions for mise-en-scene including ominous props, dark lighting with bright contrasts, calm uneasy sounds, and camera shots that hide elements or use high and low angles. The document concludes that understanding conventions allows media creators to provide audiences with a sense of security by featuring elements they expect from a chosen genre.