When you're starting research, getting a broad view of related topics can be helpful. The resources below are just some that might be useful for research in film.
This database functions as a catalog, currently covering all American films made between 1893-1974, with additional records covering selected major films from 1975 on.
This database is produced in collaboration with the British Film Institute (BFI). International in scope, it includes biographical information, cast and crew lists, awards, and citations for resources about particular films.
The Internet Movie Database is the go-to source for cast and production team lists, photos, filming locations, and other information about movies and TV shows.