Genres and Topics
Documentaries about the art and history of cinema, about how films are created, as well as biographical documentaries about people in cinema (actors, directors, screenwriters, etc). Fiction films about Cinema have their own topic.
Topics are sub-genres and/or themes of any kind (romantic comedy, buddy, sports, etc.) that describe the plot of the movie you are looking for. Topics, however, are not keywords. If you search for a topic like "shark", for example, only movies in which sharks play a significant roll will appear, such as 'Jaws'. But not every movie that has a shark in it will be listed.