Continuity editing-180 degree rule

The Editing of a video establishes the structure and content of the production, along with the production's overall mood, intensity, and tempo. Continuity editing relies upon matching screen direction, position, and temporal relations from shot to shot. Generally speaking, the continuity system aims to present a scene so that the editing is "invisible" (not consciously noticed by the viewer) and the viewer is never distracted by awkward jumps between shots or by any confusion about the spatial lay-out of the scene. Classical editing achieves a "smooth" and "seamless" style of NARRATION, both because of its conventionality (it is "invisible" in part because we are so used to it) and because it employs a number of powerful techniques designed to maximize a sense of spatial and temporal continuity.
180Degree rule: A key element of the continuity system is the 180 DEGREE RULE, which states that the camera must stay on only one side of the actions and objects in a scene. An invisible line, known as the 180 DEGREE LINE or AXIS OF ACTION, runs through the space of the scene.