This website is very helpful. It explains in links about how to jailbreak your iphone, fix random bugs, and even how to use itunes and what to do in the event that errors appear!
You can even request new things on the website if your question isn't available to you. Not only does it talk about iphone usage, but the ipod touch and ipad as well.
It's based on wikipedia so the UI is simple to use and it's not easy to get lost.
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