4.06:
The purpose of a low angle shot is basically to make the subject of the photo look more dominant and strong.
A crane shot is used to take a good picture or video of the surroundings and is used because it helps show the audience or viewers the environment that the event is taking place.
A high angle shot is simply a shot taken from a high angle to either make a subject seem small or week or it can provide a sense of depth.
Sorry, it's all I know good luck!