With this adjustment layer, you can adjust the hue (color), saturation, and lightness of a specific range of colors in your image.

This command allows you to select a specified color or range of colors. If you want to replace a selection, remember to deselect all before applying the command.

A layer mask is used to hide portions of a layer and reveal portions of whatever layer is below it. You can modify the mask by using the brush tool and painting in either black or white.

Levels is used to correct the tonal range and the color balance of an image. It does this by adjusting the intensity of the shadows, midtones, and highlights of your image.