Online safety is very important today considering a lot of web sites are used for meeting complete strangers. Online safety is simply protecting your identity and yourself from any " unsavory " characters you might meet online. If you're not safe about what you do online people could easily find where you live and come to your house.
The number 1 tip for online safety is not to give out any identifying details about yourself. 2nd is do not send any pictures of yourself. Last but definitely not least if anyone makes you feel uncomfortable, tell an adult. And now some resources for parents: http://www.fbi.gov/stats-services/publications/parent-guide http://www.commonsensemedia.org/advice-for-parents/internet-safety http://www.fosi.org/resources/internet-safety-resources-for-parents.html