Moving your apps to a folder can help you reduce clutter and organize related applications under a single icon. This would be the same thing you would do with your computer or file folders.
Tap and hold your finger on the app you want to put in a folder.
This will put your iPhone or iPad in jiggle mode. You will see an X on the upper-left corner of each icon.
Drag the app on top of another app you want to put in the same folder
If you don’t like the default folder name, change it and tap 'Done'
Tap outside of the folder to return to the Home screen
Press the Home button to exit jiggle mode.