General guide to online privacy and measures you can take:

https://www.privacytools.io/

Best Firefox-forked browser today would be Librewolf. You can use and tweak about:config settings to make it even more secure.

https://wiki.mozilla.org/Privacy/Privacy_Task_Force/firefox_about_config_privacy_tweeks

https://librewolf.net/

As for private VPN services & reviews, here:

https://torrentfreak.com/best-vpn-anonymous-no-logging/

Never trust a free VPN service btw, free VPNs make money by selling user data and/or are most likely compromised by governments. VPN companies that are legit and private have lots of money and lawyers to deal with unnecessary/abusive governmental pressure.