Unlocking Camera
If you press Y it will unlock your camera. When your camera is unlocked you just move your mouse to the corner of the screen where you want your camera to go. It's kind of hard to do at first and takes a bit to get used too, but it really helps your map awareness and just makes the game a little bit easier in the long run. Sometimes when someone you want to see is under turret and you have vision on them but can't see them in your screen, you can't just walk under their turret to see them. Having your camera unlocked really helps with that. Also if you press "spacebar" it will center the camera back on your champ as if the camera is locked but if you let go of the "spacebar" it will go back to unlocked. So that really helps in teamfights when you are trying to find yourself.
Sorry if I worded it wrong or if I have bad grammar or something. I just wanted to help newer players. Best of luck on the Rift!