The Healing Brush and the Patch tool are two basic tools which are used for retouching. These tools are very similar, except that when we use the Healing Brush, we must paint the area we want to repair, with pixels that we pick up from another part of our image and when we use the Patch tool, we must make a selection of the area we want to fix, we drag this area to the area we want to use to repair the first one. Then the original area will be replaced with this one which we choose.
Photoshop Tutorial by YouTube user: ranash1995