If you haven't seen this, it is well worth exploring and going through it with your kids.
The website and resources are called Thinkuknow, but is part of the National Crime Agency, specifically CEOP Command (Child Exploitation and Online Protection).
You choose the age range, then there are related videos the kids can watch, and then a game at the end to cement their understanding. There are also resources for adults, as well as a reporting function if kids or adults have had any problems online or concerns.
With kids spending longer online than they probably would do normally due to homeschooling and lockdown restrictions, it might be worth making sure any bad habits or lack of understanding are nipped in the bud.
Check it out, www.thinkuknow.co.uk obviously spread the word.