How to Use the Photoshop Marquee Tool
From Eric Miller, former About.com Guide
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Putting the Selections to Use
Once you have selected an area, you can apply different uses to that area. Use a Photoshop filter and it will only apply to the selected area. Cut, copy and paste the area to use it elsewhere or alter your image. You can also use many of the functions within the “edit” menu, such as fill, stroke, or transform, to only change the selected area. Remember you can create a new layer and then fill a selection to build shapes. Once you learn the marquee tools and use them with ease, you will be able to manipulate not just the whole, but parts, of your images.