What Linux OS models are there?


Can someone please give me a list of the Linux OS models that exist, and which one is suitable for which conditions?

I want to try a Linux. I currently use windows XP. I am not good in programming, but I'm willing to learn as much as I can in this area.
Update: Thanks,
Also, can I put a 64 bit OS if my OS now is 32 bit?
(maybe a stupid question)
4 answers 4