The extent can mean doing basic things like installing and AD blocker, using a password manager, surfing in isolated sessions (incognito mode) to stop cookie tracking and to leave no forensic artefact on your device, always posting with pseudonyms, using privacy-aware operating systems like Linux, etc
Then you have the extreme options available like Tor, using Qubes, GrapheneOS on your phone, changing your legal name, using burner phones, Faraday sleeves, VPNs for public Wi-Fi, network segmentation for IOT devices, disabling Intel Management Engine. Having multiple operating systems for compartmentation purposes, etc
There is a privacy rabbit-hole to get lost in. Luckily I’ve found a reasonable middle ground and am not one of those LARPer types who take it all too seriously.