Use loptop that can install linux?

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http://www.linuxquestions.org – I want to get a very cheap use loptop so i can learn how to install linux. I want to test out a beginer skills. To learn how to program linux and play around with programing. How many GB do i need? Will window xp work? Will IBM laptop work? Or any kind of laptop will work? What else do i need to know before i get a use laptop? I want to get a use laptop so when somthing go wrong i don't worry about it. I'm new to the tech industries. (HowTos)