The 180 degree rule states that in a scene with two characters, their left/right positioning should remain consistent from each shot to avoid confusing the audience. Match on action is when two shots are cut together to seamlessly continue the same action. Shot-reverse-shot is an editing technique where the camera alternates between two characters in conversation, maintaining the 180 degree rule. Shot variety uses different shot types like close-ups, mid-shots and long shots to keep audiences engaged and convey meaning.