Behold, the power of Photoshop

The most valuable advice you can receive about digital photography is to shoot in raw. These files will have .nef endings, and you can edit them in Camera Raw in Photoshop. These raws files contain significantly more information than jpeg files, which will allow you to make drastic changes.

I taught myself things about aperture and shutter speed through trial and error because I bought an expensive DSLR camera and didn't have access to Photoshop (or a computer that could even handle photoshop) and therefore I couldn't correct mistakes digitally. The photo on the left would have previously been useless to me. But now, with the power of photoshop...

Original image vs digitally edited image