Not much
- Full disk encryption on my computers.
- Password manager, for strong & unique passwords everywhere
- Linux as my OS
- Firewall.
- Backups: local (encrypted) and remote (encrypted).
- Computers are all wired to the network, no WiFi.
- Also, I use my phone as a... phone and for little else.
I mean, there is a 2FA app and the few mandatory apps I must have access to (finance, and banking) and that is it. No social, no games, no nothing. Not even email is configured on that trash piece of corporate spyware. I sincerely consider it a threat to our privacy so I don't trust it beside what I have no option to trust it with. I also suppose that this device, even though I deactivated the setting, is constantly listening to what we say nearby. So, when I don't need it, I store it in a thick box to reduce whatever it may be recording. - I use as little digital tools as I can. I went back to analog (ie, for my agenda and I hardly see any reason to go back to digital). I take all my notes longhand too, and it's been more than a year I have not read an ebook as I went back to analog there too. Why? No spying, no tracking of what I read and what I write. And no sudden 'termination' of services or 'removal' of a book from my device for any reason.