There are many ways that people use Photoshop in their digital workflow. Some people use the powerful tools and filters to precisely correct levels and curves, selectively sharpen parts of the image, tone up or down the highlights and contrast, soften and retouch skin tones and use layer masks to adjust parts of a digital photograph.
Other people use them in different ways.
This obviously proves that Photoshop was designed by men.
Actually, if you’re interested in learning how to do stuff like this, you might want to check out Scott Kelby’s book, Photoshop CS4: Down and Dirty Tricks. If you use Photoshop Elements, check out Rob Sheppard’s Photoshop Elements 8: 100 Simplified Tips and Tricks.