The magic wand tool lets you select parts of an image based on color similarities of adjacent pixels. The move tool lets you move a selection marquee or objects on a single layer. Each tool has its own Options palette. By default, the Options palette is grouped with the Navigator and Info palettes and is located on the right side of the window. To open the Options palette for a tool, you double-click the tool in the toolbox.
Every new file is created with a background, which can be converted to a layer.
When you scan an image and open it in Photoshop, it is placed on the background. Layers are a fundamental part of Photoshop's versatility. The Layers palette shows all layers in an image. It is organized with the most recently created layers at the top of the palette. When you create a new image in Photoshop, the background layer is the first layer in the image.