Hosting forums: Best way to learn?

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Maybe some of you can help out a relative newbie...

Sometime in the near future (maybe a year or so) I want to start up a
web site that is basically just a forum. However...I don't know a lot
about how one works behind the scenes.

So, if the above information isn't too general, where do I look for
info about forum site management? How-to books, web-sites would be a
plus. Free stuff--even better! Thanks!

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