When you partition your hard drive, create a separate /home directory.
break it good, break it often. Reinstall, reformat your / (root), but save your /home...that way you can recover easily from your mistakes.
learn about the terminal or command line, Two first commands:
"Blah" that will help you research "Blah" or whatever commands you are interested in.
"blah" will search the man pages for keywords.
Google: "The Linux documentation project" some good reading in there
Continue to ask questions here
that should get you off to a good start