The e-Safety zone contains resources, links, advice and support for children and young people, parents/carers and education professionals, and promotes safe and responsible use of the internet by all. 

https://saferinternet.org.uk/guide-and-resource/young-people/resources-for-3-11s

https://hwb.gov.wales/zones/keeping-safe-online

This is a very useful page for parents/guardians about children staying safe on apps/games/social media:

https://hwb.gov.wales/keeping-safe-online/in-the-know/