There are a wide variety of sources to help parents and carers to support their child to stay safe online and to also keep others safe online.
If you are to read one piece of advice, this leaflet from Childnet is packed with practical tips, information, conversation starters and rules for safer internet use. Please read it.
All of the below websites offer trusted, relevant and updated advice:
Net aware (with advice from the NSPCC): https://www.net-aware.org.uk/
Parent Zone: https://www.parents.parentzone.org.uk/ This website has the opportunity to sign up to the parent community for updates and newsletters. Their top articles https://www.parents.parentzone.org.uk/toparticles are really useful to help you start that conversation with your child about their internet use.
Be Internet Legends Interland: https://beinternetawesome.withgoogle.com/en_uk/interland This fun platform computer game for children helps them to learn about online safety.