How to understand montage in movies?

Let's start with the word "montage". Different places have different meanings: in France, the word montage has several meanings. It was originally an architectural term-scaffolding, and later it was extended to the meaning of structure, assembly and installation. In art, it is extended to compilation, that is, putting a bunch of photos or paintings together to form a painting. Then use it in movies to represent editing; The theory of "montage" discovered by Soviet filmmakers in the1920s is that editing two shots together can produce a third meaning; (detailed later). In Hollywood movies, a "montage paragraph" is to connect discontinuous short lens groups and compress a space-time or information. Usually, a series of shots are accompanied by music. So how did this "montage" come about? At first, the film was shot with the camera on. In the earliest times when the film reproduction technology was underdeveloped, the Lumiere brothers even made one film and sold one-every time someone saw "The Train Entering the Station", of course, whether it was the public screening of the Lumiere brothers or Edison's solo viewing, the films at this time seemed to be just gadgets. Many films only filmed an actor's performance, but also filmed the whole body from head to toe, which was no different from drama sketches. Edison didn't pay much attention to it himself, but Edwin Staton Porter, an assistant who was hired to shoot a short film for him, noticed it. Mr. Potter, an electrician, began to study movies and conducted experiments on film editing. As we all know, in the 6-minute short film "The Life of an American Firefighter" (1903), he first tried the film techniques still used in modern times, such as fusion shooting and close-up. Most importantly, in this film, he spliced two scenes from different spaces together for the first time to complete the narrative. The first fire truck, the second burning woman in the room (set), is the first time in the history of movies to break the framework of drama and really tell stories with movies. In the same year, Potter shot great train robbery while the iron was hot (1903), which further developed this film narrative technique.