Magic Wand

The next tool is the Magic Wand.

Hold down on the Quick Selection tool to find the Magic Wand.

The Magic Wand will select all the same colors within a range set by the Tolerance that you can adjust.

Another valuable switch is the Contiguous checkbox. With it checked, the selection stays to colors that are connected. Without it checked, you select all the pixels in the image that are that same color.

Here is a great video showing how to use Magic Wand