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.