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Hello Kate.
Don't worry. I was all new to Xoops, just like you, a couple of weeks ago. I was a bit overwhelmed at first, but now it is all falling into place. XOOPS makes presenting and maintaining a coherent and good-looking site easy! (I've been struggling with that for YEARS) And this I can say after just a few weeks. So have a look around in the forums and documentation and you will experience the same. I got my hands dirty at once by installing and dabbling with it. I suggest you learn by experimenting, just like I did.
If you have any specific questions, don't be afraid to ask. (You can use the search prior to posting to see if your question already has been answered) I've discovered that people here are very helpfull.
Good luck!