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You could install Cygwin
in Windows to have a Linux-like environment to practice your commands. That way you don't have to change anything on your computer. You could also install a Linux distro alongside your Windows installation and making your computer dual-boot. If you just want to go ahead and play with the Linux console you can have a look at this site SDF Public Access Unix system
, create a free account there and you'll have SSH access. I haven't tested the capabilities of SDF but it should get you started with the basics.