Stamp tools are used for patch-working or unify image.
How to use of the Clone stamp tool:
We use this tool only unify images or remove any spot from any object/image.
-Click to Click to the image.
-Then click to the spotted area.
We use the Pattern Stamp tool to set any pattern in a specific image/object area.
-Choose any pattern.
Photoshop have many pattern. So you can load many more pattern.