I'm going to be taking two computer maintenance class in the fall so I can learn to build and maintain my future systems. what is the minimum hardware requirements I can use to run some version of Linux (easiest version for a ground floor newbie). So if I run across some smoking deals on used systems, I'll know what I need to buy

thanks for the help

PS I'm so new, I start CIS 105 class and a "Microsoft Command Line" Class this coming Tuesday. That's so I can take the 2 computer maintenance classes and a Linux class in the fall