“The Internet Safety Cheat Sheet [ISCS] is a list of non-techie explanations that teach you how to quickly adjust settings and mobile devices to make the web a safer place for your kids”.
Originally offered as a downloadable PDF, the ISCS is now a website created and updated by Jen Gordon, a mom/designer worried (as many others) about the level of access that their children can have at home, but it is perfectly applicable to schools.
Source: Internet Safety Cheat Sheet