When a user selects clicks an item from the toolbar, the mouse cursor changes accordingly' The mouse

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• When a user selects (clicks) an item from the
  toolbar, the mouse cursor changes accordingly.
  The mouse icon is how a user knows which tool is
  selected. The item selected is also depressed on
  the toolbar, as the eraser is here.
• Let's go over each tool from the upper left of
  the toolbar
• The Marquee Tool With this tool, you can select
  an area on the image. In the case of the example,
  you can draw a box on the image. Inside that
  image will be selected.
• There are 5 different versions of this tool. The
  square selection tool, the circle selection tool,
  the horizontal and vertical line selection tools,
  and the crop tool. To access a different
  selection tool, hold the mouse button while
  clicking on the item in the toolbar. A submenu
  will appear and another tool can be selected, as
  the example demonstrates

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• Once you have the area selected, it is time to
  crop the image. Either double click inside the
  box, or go to the image menu, and select crop.
  Everything outside of the image is gone.

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• Any tool with a small arrow has more tools. To
  access the hidden tools, just hold down the mouse
  button when selecting the tool and a similar menu
  will appear.
• The crop tool is one of the hidden tools under
  the selection area tool. With the crop tool you
  draw a box around the area of the image you wish
  to crop. Once the box has been drawn, you can
  adjust the size of the box.