Who is the computer for? If it’s for you get any desktop computer with at least 200 gig hard drive.as long as you don’t have a wifi card your ok. The Problem is if you have a kid he can slip in a wifi adapter which cost a few bucks, into a usb port and you would never be any the wiser.
You should also delete internet explorer from the hard drive. You are going to have download programs. Otherwise it will just be a paperweight You are going to have to use XP or prior as your operating system.