People make mistakes. The thing with the mistakes on the internet is that they are public and tend to stay there forever- so best to learn how to keep safe on line from the early years.
https://esafety.gov.au/education-resources Excellent simple resources for kids and parents
http://www.iness.com.au/resources - Brett Lee’s site with useful references
https://sites.google.com/site/cybersafetyresources/home Allanah's Diigo |Shared Cyber Safety Resources