I learned a lot by reading tutorials and looking at artists I admire on Deviantart.com. If there's a style of photography you want to learn, or any tips or tricks, it's been described somewhere there.
Go and do a search for photography tutorials and you'll be delighted at what comes up.
There are also clubs for specific styles of photography there with lots of information and amateurs (and pros) of all levels who will frequently answer any questions you have about their work, from set-up to touch-ups.