Sperate browsers for work and private

Use Facebook as little as possible, but it's ok to be on there I think, if it's needed to stay on touch with people.

Disable location for most apps

Use AdBlock and a cookie blocker

Use DDG or something else then Google for search

Use different usernames on different sites

Don't dox yourself

Use at least two emails, one primary and one you give away to get random deals or whatever else. Let all the emails here go to a folder that is automatically marked as read, just so you can check it when you want to

I created a new Reddit user every year or so, but that might be too far for some.