Is montage one of the filming techniques?

Montage is not a shooting technique, but a general term for the connection between shots, with specific classification.

Montage generally includes two aspects: picture editing and picture composition. Picture editing: a unified picture work composed of many pictures or patterns juxtaposed or overlapped, picture composition: the art or process of making such a combination. This film combines a series of shots taken in different places, from different distances and angles and in different ways to describe the plot and portray the characters. However, when different lens groups are connected together, they often have meanings that each lens does not have when it exists alone. Eisenstein believes that when opposite shots are connected together, the effect is "not the sum of two numbers, but the product of two numbers". With the help of montage, movies enjoy great freedom of time and space, and even form movie time and space that are inconsistent with real life time and space. Montage can produce a third action besides the actor's action and the camera action, thus affecting the rhythm of the film.