Corlin wrote: “What ad Blockers do people recommend?”
You’re best bets for Safari are the Content Blocker extensions from the App stores (Mac and/or iOS). They can come in a flavor that makes it impossible for them to track you or access the pages you load–they basically hand a huge list (or several lists) of blocked addresses to Safari, and Safari does the blocking. Some will let you dynamically change the configuration in ways that could let them read your web pages and track you if they want to, but it’s clear in the Safari Prefs (Extensions) which is which, even if the app itself isn’t.
I’ve been using 1Blocker, which comes in two parts, one that has preconfigured lists that you can turn on and off and also make changes to, and one part (1Blocker button) that lets you change the configuration dynamically, such as using a contextual menu item on a banner to hide it in the future. That part could watch what you do, so if you don’t need the features or don’t trust the developer (or whatever third party frameworks they might be using) you can turn that off and still keep the other blocking.