30 Degree Rule:
When creating a video, the view in each individual shot of an action, character or scene needs to change throughout the composition. This keeps things interesting for the viewer and helps you, the director, creatively add new surroundings and information to the plot.
Typically, there should be a minimum of 30-degree change in the point of view when you’re trying to communicate a new element. Otherwise, the shot risks feeling repetitious.
180 Degree Rule:
Another good degree rule to keep in mind involves filming the interaction of characters. When two people interact on camera, their eyes create an imaginary axis. Generally, you should try to keep the camera on the same side of this imaginary axis regardless of whether you move it around for wide shots, close-ups, two-shots, over-the-shoulder shots, and so on.