It is important to me that you get a good understanding of iptables and how to use it from this post since I think there is a lack of good guides about it. I believe it is way more helpful to explain fundamentals well compared to just handing out instructions to follow. With a good understanding, you will be able to help yourself a lot better in case you run into problems.
Thanks for posting, I am always interested in skimming through other WireGuard VPN setup articles to make sure their keys are generated securely (correct file permissions set). Here, I actually learned about the go= syntax with chmod! It sets the permissions of group members (g) and others (o) to what comes after the = - which is nothing.
This is great if you have zero trust and want to build everything yourself, but anyone looking for a more turn-key solution should take note of Tailscale. They do the plumbing for you and you can have all your devices in a mesh VPN (uses WireGuard under the hood).
I have both. Mullvad to hide/change my IP if I need to and WireGuard to use a VPN for it's original purpose: to connect all my devices together and host some internal services like password managers.
go=syntax withchmod! It sets the permissions of group members (g) and others (o) to what comes after the=- which is nothing.