Well. In Theatre,
You'll learn stage directions from the point of view from the stage. View the diagram below.
Acting
Actors are some of the key points to a show. They're the ones who bring the show to life. They give personalities and emotions. Pretty much like every day people. If they're really good they make big bucks in Hollywood and other places like that. If you get a group of actors and use them to their strengths, you'll have a great show; but if you let them pick their parts and they do horrible at them then your show will most likely be a disaster.