These websites have useful information that parents can access to develop their own knowledge of online safety issues.
UK Safer Internet Centre
Has a variety of guides for parents including how to set up parental controls offered by UK internet providers.
NSPCC Net Aware
A guide to the social networks mostly commonly used by children. Includes games like Fortnite, Roblox and Minecraft.
This site from CEOP has articles covering a range of online safety issues. Has guides to setting filters on YouTube and how to set up privacy on different apps.
Has guides including game ratings, Fortnite and how to restrict viewing on Netfilx / Amazon Prime.
Get Safe Online
This site has advice on a large range of topics covering safeguarding children online. Also offers advice about other online issues such as how to protect your computer.