If you have friends and relatives who use Facebook and Instagram, need to use apps like Waze and ride-sharing and store apps, log in to stores and banks, log in to file-sharing accounts for business, and want to view various content found in sites, as well as want to block ads, customize your desktop interface (like maintaining browser window sizes), want fast browsing, etc., then you might encounter problems when using non-Android systems, vanilla browsers, VPN, etc., not to mention older versions of browsers, and built-in cookie managers and ad blockers that might not block as much as you want.
Given that, here's what I did:
1. Firefox with about:config tweaks;
2. Cookie Autodelete set to whitelist only cookies needed for logins or to maintain settings in various sites;
3. Multi-Account Containers: put certain sites for personal and business use in containers, and everything else left outside with non-personal accounts;
4. A wide-spectrum blocker (like uBlock Origin, but now Adguard because of a lifetime sub promo, which can also be used for Android phones) and anything else;
5. For sites with both a personal and non-personal account (like Google), another browser (Iridium) for the personal account.
Anything tracked will involve non-personal accounts. Personal/business accounts are isolated in containers.
For anything beyond that, there's Tor and VPN.