Nice feature in Google Photos - Select Free up space to delete your items
A nice newer (as of 3/21/2018) feature in Google Photos is the ability to select remove items from device. This is a great feature and such a time saver since you will not need to go in an go through all your photos and videos to delete them.
Embedded below is a 57 second YouTube tutorial.
Please note that at the end of the Free up space, you will then be reminded how to permanently delete your items.