Learn linux? You don't "learn" linux. You consume it, much as it will consume you. It will show you frustration, regret, time spent, agony, etc.
Get books. Read. Don't ask people questions without reading first. I've been using Linux for nearly 6-7 years and I still learn new things almost weekly. One more time, READ. There is documentation out there for everything, you just have to find it. Google becomes a good friend of yours, and if you're at odds with Google, then you two need to make up.
If you're planning on using Linux for personal reasons, then start with Fedora or Mandrake. However, if you're going to start learning for Enterprise/Production Server purposes, then start with Debian or Gentoo. For enterprise stuff, don't worry about GUI, as you will hardly ever use it.
Learn to love the command line. RHES sucks. It's for people who want to use the GUI to do enterprise work. That may work ok where they are now, but what if they change jobs and have to do the same thing via command line only. If you already know the command line, then your transition should be quite easy.
Make sure you know about cron and how jobs are run. Make sure you know how to use vi/vim, though I prefer nano. Make sure you know how to start, stop and restart processes running. Regular expressions can be your best friend and worse enemy at the same time.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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