It can be as simple as showing them to open incognito for specific searches or topics, or to install a trusted tracker blocking extension like ublock origin and set it up for them.
Managing app location privileges is a big one too, iOS is really good about nagging for background location permissions and I appreciate that a lot, but a lot of people don't realize if you give Facebook or another app "while using", you can bet money it will use it whenever you open the app.
https://business.financialpost.com/technology/tim-hortons-ap... The Tim Hortons app logged this guy's location 2,700 times in 5 months. He didn't find out until the iOS 13 background location warning.
https://cdn.iphoneincanada.ca/wp-content/uploads/2019/06/ios...
People care, most of them just aren't as literate as the typical HN user so they either don't have a clue what's really happening, or simply throw their hands up in the air.
There's an entire class of problems you cannot solve through 'hygiene.' Equifax, for example, collected data on you without your consent, and got in trouble for unintentionally giving it away when they're supposed to be getting money in exchange.
Vast majority of people today know Google/Facebook is Big Brother and that knowledge doesn't matter to them nearly as much as some hoped.
This whole pandemic kind of proves that we haven't learned the real-life hygiene, after decades and decades of that being drilled into us, and real-life hygiene having actual life-or-death consequences.
Don't hold your breath about digital hygiene.
I only know two persons in real life (other than me) that care about data privacy and act on that. Of course if you ask most people they will say that yeah they care about privacy, but their actions tell a different story.