- To get image into another.
- Copy or Paste.
- Drag layer into the picture.
- Ctrl + T  transform.
- If your picture is too big zoom out/ or you cannot see your handles.
- Hold down handles while pressing shift.
- When you are done press enter.
- Use a mask if you want to hide something.
- The shortcut to make the brush bigger or smaller.
- Left  bracket or right bracket.
- Hold down shift to make a line