How to set Ringtone in Samsung Galaxy J2(SM-J200G)?

Your device comes with a variety of pre-installed Ringtones that you can select from the Settings app. If you want something a little more personal, you can use a variety of free apps to create a custom ringtone from your own music files. You can also set different ringtones for specific people in your Contacts list. 
 
Navigate to Apps → Tap on Settings → Tap on Sounds and Notifications → Tap on Ringtones and Sounds → Tap on Ringtone → Select Ringtone
 
Pictorial representation of above settings are as follows: 

You can also set custom ringtone by clicking on Add Ringtone option.

CLICK HERE to know how to apply Theme in Samsung Galaxy J2 ( SM-J200G).