There's lots of good advice here, but one thing I see mentioned often is "get them on to operating system X." Age plays a factor in this - much as I love macOS I wish I hadn't switched my mother (88 now, around 80 when she switched) from Windows. She'd learned personal computing with Windows, and there are still things that trip her up with macOS, including basic things like differences between Windows Explorer and Finder. There are trade-offs - I've been on macOS for a long time so fixing issues is easy, remote desktop is seamless, and the risk of viruses is lower - but overall I think the costs have outweighed the benefits. Setting her up with a password manager would be even more discombobulating, but thankfully she doesn't use online (or even telephone) banking, or social media, otherwise I'd insist. She also knows that she can phone me or forward emails if she's not sure about something, and so far has been canny about spotting things like "your PayPal account needs re-authorisation" scams.