You could try Fedora Core 3. It's related to Red Hat, but its different. It's also free. I personally use it and I like it. I'm not sure how easy it is to learn, considering it was not the first Linux OS I tried.
Not a very helpful post from me here but I just wanted to let you know that I've yet to run across Unix available free anywhere. There are some *nix variants that are more similar to Unix than others. For that, I will let one of the experts here give their opinion.
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