I make these posts every once in a while but I think it's worth mentioning again that if you're interested in trying out old movies, a good option is to always see if your library includes any streaming service options you can access using your library account. Using library-supported streaming services is great because 1) supporting the library's programs means the library keeps getting funded 2) it's literally as easy as any paid-for streaming service 3) old movies are fun. I have access to Kanopy and Hoopla through my library, and here's a small sampling of what's available on them right now to stream for free:
Seven Samurai (Toshiro Mifune)
Body and Soul (Paul Robeson)
My Man Godfrey (Carole Lombard, William Powell)
Tokyo Story (Setsuko Hara)
Cabinet of Dr. Caligari (Conrad Veidt)
Charade (Cary Grant, Audrey Hepburn)
The Apartment (Jack Lemmon, Shirley Maclaine)
Wuthering Heights (Laurence Olivier, Merle Oberon)
Rashomon (Toshiro Mifune again)
Metropolis (Brigitte Helm)
Umbrellas of Cherbourg (Catherine Deneuve)
The Court Jester (Danny Kaye, Glynis Johns, Basil Rathbone, Angela Lansbury)
Chitty Chitty Bang Bang (Dick Van Dyke, Sally Ann Howes)
Sunset Boulevard (Gloria Swanson)
A Place in the Sun (Montgomery Clift, Elizabeth Taylor)
War and Peace (Audrey Hepburn, Henry Fonda)
I haven't seen all of these movies, so don't consider these recs, but this is a great cross section of genres, hotties, and well-known films if you're looking for a place to start. Use your library! It's fucking free!