This document discusses genre codes and conventions for common genres such as sci-fi, romance, crime, and drama. Sci-fi genres typically involve time travel, robots, aliens, space themes, and spaceships. Romance genres focus on relationships, with themes of male-female interactions, smiles, laughter, and struggles. Crime genres feature car chases, robberies, murder, police, and investigators. Drama genres may include fights in pubs, family problems, and love problems.