there's not much point in rooting until you have a different ROM / firmware to put on it. if you like how the Arc is behaving, leave it alone and let it be. i haven't bothered to root my Arc HDs cuz they're fine and i kind of like the kobo skinned android they're running. i only rooted my nexus phones to roll back firmware (and nexus devices are the easiest to root by nature)
if you want to learn just for the learning of it, a quick google search of "how to root ___" should land you a few results. XDA forums will likely pop up as one of the results.
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