Google's "Be Internet Legends" online safety initiative looks like a great idea. I like that it covers social concepts like over-sharing, bullying, scams and phishing, as well as technical ones like securing accounts and devices. It's aimed at children but I'm sure a lot of adults could learn from it too:
This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!