How to delete Image in Samsung Galaxy J2(SM-J200G)?

You can Delete images from Gallery application or from My files folder. 

Navigate to Apps → Gallery → MORE → Edit → Folder → DELETE  

Pictorial representation of the above settings are as follows:  

a). Tap on Apps icon from the Home screen.

b). Tap on Gallery icon.

c). Tap on More.

d). Select and tap on Edit.

e). Select the Folder by marking the checkbox.

f). Tap on Delete.

g). Tap on Delete.

CLICK HERE to know how to share Image in Samsung Galaxy J2 ( SM-J200G).