Have you ever applied an adjustment to a layer and then wanted to apply the exact same adjustment to another layer? Let’s say you applied Color Balance, and for some reason you applied it as an adjustment rather than as an adjustment layer (there are times when you’d need to do this). Now you choose another layer and want to apply the exact same adjustment. You could try and remember the settings, or you could try to travel back in time and write down the settings. The easiest method, however, is to hold down Option (PC: Alt) as you select the same adjustment from the Image>Adjustments menu again. If you invoke the Option (PC: Alt) key, the dialog will open with the previous settings already applied. I know time travel would be much more fun, but this is probably easier and safer.
This tip previously published in Colin Smith’s Photoshop Tips column, in the April, 2020 issue of Photoshop User magazine.