180 degree rule

The 180 degree rule is a basics camera rule used when shooting a film. If you break the 180 degree rule then the scene or film clip won`t make sense, unless you break it for the effect as long as the audience is clear you have done this.
180 degree rule:
If there was an invisible line across your film. That would be your 180 degree rule, line. You have to pick one side of the imaginary line to place your camera. Once you've chosen which side you would like to place your camera, your camera can move freely around that section andat any angle along the 180 degree line but cannot cross to the other side, otherwise your creating frames of film which do not make any sense. The video above talks you through the 180 degree rule and what to do and not to do.