Have you ever mistakenly taken lots of pictures of the inside of your pocket? or your thumb over the lens of your phone? Using Google Photos on your smartphone, it’s easy to select them all and delete. Just touch and hold on the first one and drag thru the rest of the group. You can select a few or even hundreds of photos this way. In fact, the only problem with it is that it is too easy! With one little slip of the finger, you can select hundreds when you only meant to select a few. It just takes a little practice to get just the ones you want.
When they are all selected, tap the trashcan icon to delete them. This will delete them from the device as well as from the cloud. The trashcan icon means, “these photos are garbage, delete them from everywhere.”