1) The document describes various camera shots and techniques including trackshot, close up, high mid shot, mid shot, cut away, wide shot, trombone shot, steadicam shot, point of view shot, and rotational steadicam shot.
2) These shots are used to reveal information, focus on characters' faces and emotions, show backgrounds and perspectives, and give impressions of fear and a falling apart world.
3) Close ups in particular are used to clearly show characters' facial expressions and reveal emotions.