Control center is one of the most useful features in iOS. Its purpose is to give you easy access to system settings that you may need to access quickly or easily from anywhere on your iPhone or iPad.
You access control center by swiping up with one finger on the bottom of the screen. You can do this in almost any app and even the lock screen, so long as your settings (settings > control center) has both "access within apps" and access on lock screen" set to on.
The top row in control center are all settings that can either be turned off, or on by tapping on them. When an icon is black on white that setting is turned on, when it is black on gray it is turned off. You have access here to Air Plane mode, Wifi, Bluetooth, Do Not Disturb, and Lock Screen Rotation.
Down from there you have a brightness slider control. This allows you to quickly adjust the level of the backlight on you device. Just slide right to make it more bright and left to make it less.
The next section contains the standard audio controls: Play/Pause, volume and fifteen second skips backwards and forwards.
Then we get the airplay and air drop controls. However these controls only appear if they are turned on and can be used. For example if you had wifi off they would not show up because they require wifi to function. Similarly if there is no device around to connect to they will not show up.
The final section of control center contains a row of quick access apps. You cannot control which apps appear here unfortunately so hopefully you like the selection that Apple has chosen. You can use the flashlight, the timer, the calculator, and the camera. Personally I think this is a useful collection, and I use control center to access all of them regularly, except for the timer.
Using control center can help you save a lot of time leaving apps or unlocking the phone to go to the settings app when something just needs to be done quickly. I hope you find these tips helpful, and remember, live better.