Camera
You can take open the camera app with or without unlocking your phone. Open the camera app if your phone is unlocked, or tap and drag the camera icon on the lock screen to open it without unlocking your phone.
Zoom easier. Tap and slide the camera button from right to left to zoom in and out. You can also pinch fingers together (zoom in) or apart (zoom out).
Take burst shots. If you want to take a whole bunch of pictures in a row, just tap and hold the camera button. It will take photos in rapid succession.
Switch camera direction quickly. Instead of tapping the small button at the top of the screen to switch the direction of the screen. You can just swipe down, and it will switch the direction of the camera.
When looking at a picture in gallery or photos you can edit photos. Your phone has its own editing system built in. However, it may not have everything that you want to do for editing. In this case, you can find apps on an app store that can do this for you. Other apps are valuable for doing things such as teeth whitening. You can pay for editing apps to get more advanced editing. The free ones can do a lot though too. A few examples of apps you can get are Free Movie Editing Pro (No Ads) ($1.99), or Photo Editor Pro.