There are a lot of ways to add patterns in Photoshop, but one of the most common is to use the Pattern tool. The Pattern tool can be used to create lines, shapes, and other patterns. You can also use the Pattern tool to create logos, illustrations, or other designs. When using the Pattern tool, it is important to be aware of the following:

  1. The Pattern tool can only be used on a single layer.
  2. The pattern must be created in a specific format.
  3. The pattern must be placed on a specific object.
  4. The pattern must have a defined size and shape.