Background Tutorial

EDIT>>>>
Wow! I wasn't expecting this to be so popular, for it's quality! It's my simplest tut,(and in my opinion, it ain't all that great) but hey, I'm glad it's been so helpful. Thanks guys!
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Yay! Forest Background!!!! I'm gonna use this background for one of my pics. I referenced from a scene I found on Google, and it helped a whole lot! So this is my first tutorial, is it good for my first???