Understand layers before you start cropping.
Photoshop layers are versatile tools, essential for almost any graphic design project. They let you composite multiple images, add text to a graphic, stack vector shapes into one design, and more. Layers also give you ways to edit and crop nondestructively, so you can make reversible edits and maintain image quality as you work.
More ways to crop in Adobe Photoshop.
When you crop images, you are trimming off areas of a photo or design to cut out unwanted items or adjust the composition. When you use the traditional Crop tool in Photoshop, it affects the whole image, including all of the layers and the aspect ratio, or the dimensions of your image. You can’t use the Photoshop Crop tool on single layers, but there are different ways to edit layers so your changes won’t affect the entire canvas.