The one element of a screenplay that audiences notice and (usually) attribute to the writer is the dialogue.
That's because most moviegoers have never read a screenplay and don't understand that dialogue makes up a mere fraction of the words that are necessary to create the world they are watching on the screen. Much of the craft of screenwriting is the economical choice of words and phrases, carefully constructed and arranged on the page, to bring a movie to life in the mind's eye of the reader. And the majority of those words are not dialogue.
In a recent episode of the ScriptNotes podcast, screenwriters John August and Craig Mazin look at short excerpts from seven produced screenplays across a variety of genres to break down different styles of how to write everything in a screenplay except the dialogue...