Photoshop Tutorial
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YOU CAN DO WHAT?
Advanced Image Workflow Enhancements
Dodging & Burning
Make sure your foreground/background colors are set
to default [press D]. Bring the opacity of the top
layer down to 50% and select the paintbrush tool. 
Bring the paintbrush opacity down to 50% and start to "paint in" where you wish to darken. Or switch the default colors and you will begin to lighten.
This method does not damage the pixels, resulting in a cleaner burn or dodge.
