The document discusses common codes, conventions, and techniques used in horror films. It begins by defining codes and conventions, and explains that codes are technical or symbolic ways of communicating meaning, while conventions are generally accepted ways of doing things within a genre. It then lists and describes several common conventions in horror films, such as films being set in isolated locations, characters ignoring threats of danger, the power being cut at scary moments, phone lines being cut, characters investigating strange noises, victims running upstairs instead of outside, and more.