1. Use the camera grid
Using the theory rule of thirds, where by images are more aesthetically appealing when the main subject lies one third of the way across and down on your image. Following this theory makes an image more interesting than if you put the subject square in the middle.
To help you with this there is an option to place a grid of thirds over your viewfinder screen. The button to turn this option on isn’t found in the camera app itself but actually in the “Photos & Camera” section in the “settings” app.