There are a few ways to crop an individual layer in Photoshop. The first way is to click on the layer thumbnail and then drag it to a different location on the canvas. The second way is to use the shortcut key (Command+Option+I) and then drag the layer thumbnail to a different location on the canvas. The third way is to use the shortcut key (Command+Shift+Option+I) and then drag the layer thumbnail from one end of the canvas to another.