I won t attempt to describe all the feature of this program. Instead ll tell you the parts as a new user I liked the best. Layers are somewhat like clear plastic sheets you can lay over an image. Whatever you do on that layer affects that layer but not the ones below or above it in the stack. If you don t like a layer you can just throw it away without destroying other layers.
Adjustment layers correct or adjust color.
What you do in an adjustment layer affects all the layers beneath it. The interesting difference in this type layer is that you can later go back and make adjustments in settings. Actions are one of my favorite features. They are like macros in that they record what you do step by step and can be replayed at will later. These saved actions can be used later to save time.