The Quick Selection Tool is one of the most used tools when making selections especially if you are looking for replacing a background in Photoshop. It’s easy to use and it allows you to quickly make basic selections.
The Quick Selection Tool works just like the Brush Tool (B), once you select it you start brushing the area you want to select and Photoshop will create the selection based on the contrast of your image. Check the video for a live demonstration.
For this practice you can use this photo or any other image you want.