For starters, today’s tip is for people not afraid to break their Linux installation. I say that because if you use this tool incorrectly, you may find your computer no longer working!
That said, Go to Menu–> System Tools–> Configuration Editor
You can’t hurt anything by just poking around, and even if you don’t actually make any changes, you can learn a lot about your Linux system my clicking through the configuration options.
Some of the things that are handy in the config editor are the ability to disable features you may not want your kids using, like using the command terminal, or disable printing, or even logging out.