Unix Toolbox is not for newbies. It’s the real stuff: command line commands that you need if you’re doing real work with real systems. Want to set disk quotas? Change MySQL logins? Set file permission? Encrypt partitions? All those questions, and more, are answered here.
Warning: if you don’t know what those things are (or even if you’re not sure), Unix Toolbox probably isn’t for you. If you want to know what those things are, check it out when you’re ready to experiment.