
Adjust settings as needed:

To see a leveler, so you know when your shot is parallel to the horizon, turn Leveler on 
When using the camera, you'll see three white lines in the middle of the screen. To make the lines meet, rotate your phone left and right. When you're level, the lines meet and turn blue.

Use an on-screen leveler to align your shots:


With the front camera, when you look at the screen to take a selfie, you'll see a mirror image: left and right are reversed, and text looks backwards.
You can change if the selfies you take match the screen or are flipped:

For Selfie photo mirror:

