@beav @@ I use one.one.one.one (126.96.36.199) in the app store. While 188.8.131.52 isn't a true VPN, it does help a lot and depending on your goals it might be all you need. It provides safer browsing, gets around some of the video limits, and so on. I also use nord vpn at times. It's a more true VPN but also cost money
Note, a lot of times VPNs will actually slow down your data if in an area that has good speeds! Try 184.108.40.206 first and see if it meets your needs before paying for nord or something
I think what you are talking about is manually inputting DNS in place of default ones assigned to you by your provider. The DNS address you are mentioning above belong to Cloudflare which does give you a certain amount of extra anonymity and also is usually quicker than the default. Here's the website with the rest of the options and instructions on how to use them.
Right from the ProtonVPN website. No, they don't sell your data even on their free version.