The Complete Guide for Child-Proofing Your Mac | Mac.AppStorm

I’m going to talk you through three different ways that you can go about putting in place better online safety precautions: via OS X’s built-in Parental Controls, with an external application, and by getting to the heart of how your computer interfaces with the internet, by taking control of your DNS settings.
(Link: The Complete Guide for Child-Proofing Your Mac | Mac.AppStorm)