Ultimately you want to have dedicated devices with an opensource operation system (not windows/iOS but Linux for example).. devices that you only want to use through tor and w vpn (paid) + other privacy tools (e.g. Mullvad browser) so your device cannot be linked to your ip/other identification points.

And then there's probably also stuff to research wrt the device itself (hardware privacy vulnerabilities).

So you cannot just do privacy quickly, it takes a while to learn all this (it's honestly a rabbit hole that never ends). So you have to take babysteps and reserve time for it.

I think Mullvad is the best starting point to learn privacy in general. That's what I'm doing at least. They explain a lot wrt how you are exposed online, not only through IP or cookies but also e.g. through browser fingerprints. See https://mullvad.net/en/browser.