In my intro to stills camera the exercise we did was to venture around the Hurtwood campus and capture photos of are group. The purpose of this exercise was to become familiar with the camera and the angles at which your photo best portrayed what you were trying to show, for example the over- the - shoulder shot shows the closeness in the relationship between the two in the shot.
This is my example for the over the shoulder shot and the position of the two in the fame represent their relationship as friendly and nonthreatening.
The angle of shots can make the audience feel emotions toward the person in the photograph. for example by taking the photo from an low angle looking up angle puts the person in the photograph in a position of power, this sets the person up to be a "hero". This is used in movie posters such as Gladiator.

"the hero shot"
This is similar to the way if you take a photo from above looking down it puts the person in a position of weakness and venerability. The "hero shot" puts the person in frame in a position of power and authority over others.