The document discusses several key concepts relating to how media texts are classified and understood:
1) Genre provides audiences with expectations about a text based on recognizable elements or "paradigms" like plot points, costumes or music. This allows for variation while audiences can still appreciate how elements are represented.
2) Narratives in all media texts, including fiction, news, ads and docs, involve a constructed series of events with a beginning, middle and end that audiences interpret based on their experience.
3) All media texts are representations of reality that are intentionally composed using signs and symbols. Audiences need media to make sense of the world, but representations also reflect a producer's perspective.