180 Degree line of action

In film making, the 180-degree rule is a basic guideline regarding the on-screen spatial relationship between a character and another character or object with a scene. An imaginary line called the axis connects the characters and by keeping the camera on one side of this axis for every shot in the scene, the first character will be in the right frame of the second character, who is then always frame left of the first.  If the camera passes this axis, it is called jumping/crossing the line.

         Shot-reverse shot

Shot reverse shot is a film technique where one character is shown looking at another character (often off scene) and then the other character is shown looking back at the first character is shown looking back at the first character. Since the characters are shown facing opposite directions, the viewer assumes that they are looking at each other.

Match on action shot

Match on action is an editing technique for continuity editing in which one shot cuts to another shot portraying the action of the subject in the first shot. This creates the impression of a sense of continuity- the action carrying through creates a "visual bridge" which draws the viewers attention away from slight cutting or continuity issues.