Can't quite get the camera in the position you want it? Well this quick hack will help.
Position your view in the scene window where you want the camera to be and the direction you want it to look in.
Select your camera in the Hierarchy window
Press CTRL+SHIFT+F (Windows) CMD+SHIFT+F (Mac) to move the selected object to your current scene view position.
This works with any object you select in the Hierarchy window, but works best with cameras.