Start with the shell/command line and study its infinite capability. A good place to start would be Zed's site. http://cli.learncodethehardway.org http://cli.le

Start with the shell/command line and study its infinite capability. A good place to start would be Zed's site. http://cli.learncodethehardway.org http://cli.learncodethehardway.org After that follow the advice of kcvv - take notes, rebuild VM's again and again building on your new knowledge.