The document discusses several subgenres of horror including supernatural, dark fantasy, sci-fi horror, psychological horror, Lovecraftian horror, gothic, splatter punk/slasher, satanic/religious/occult, erotic horror, suspense/thriller, weird fiction, and speculative fiction. It also outlines some common codes and conventions in horror films such as dark settings, low key lighting, orchestral music, stereotypical characters, and victim costuming.