This article will teach you how to close unused apps on iPhone, iPad or iPod Touch.
Steps

Step 1. Unlock your device
To do this, press the power button (located in the upper right side of the device), enter the password, or place your finger on the Home button.
The device must be turned on and unlocked, only in this case you will be able to manage the applications installed on it

Step 2. Press the Home button twice
It's a round button under the screen of the device. All open applications will appear on the device desktop.

Step 3. Select the application you want to close and drag it to the edge of the screen
The app will close when it disappears.
Repeat the process for all applications you want to close
