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I guess it's not bad for Photobucket, but you're very limited with things you can do with them.
You should download GIMP and learn from there. It's pretty much just as good as Photoshop, perhaps a little more complicated to us Photoshoppers but I'd say it's just as good when you learn how to use it.
You can find many tutorials for GIMP and learn easily. If you do decide to download it you can find all the tutorials you need on