The File Browser has a ranking feature that you can use to group and sort image thumbnails. This gives you an alternate way to sort images in the File Browser thumbnails pane. You can invent your own alphanumeric code to assign rankings, such as numbers, one or more letters, words, or combinations of these.
In this exercise, you’ll let “A” stand for the best and most usable images, and “C” for the poorest quality or least desirable photographs, with “B” for medium quality. Which letter you assign to which image is a personal judgment, so there are no right or wrong answers for letter designations, and—unlike the real world, perhaps—no one will take offense at your choices.