• How can I crop just one layer of my document?

    When you want to crop one layer of your layout without cropping the entire document, first select the layer you want to crop.
    Get the Marquee tool and drag out a selection around the portion of the layer you want to keep.
    Press Ctrl + Shift + I (Mac: Cmd + Shift + I) on your keyboard to select the Inverse.
    Press Delete or Backpace on your keyboard to delete the section of the layer you want to erase.