Layers are a very important concept to understand in Photoshop.
Layers stacked like pieces of paper.
A new one covers up the one underneath it.
Layers on the bottom of a list will be behind layers on the top of the list.
Together, the layers in the document compose the image that you see on your canvas.
Layers can be grouped and organized together, renamed, and their visibility may be turned off or on at any time.
By putting changes on separate new layers, the original image and your editing work is preserved.
This way, changes can be made later without having to redo a lot of work.
Be sure to save the document as a PSD so the layers can be accessed later.
