Three things people call "a VPN" that operate at different layers. The cryptographic protocol differences between WireGuard and OpenVPN, why Tailscale is a control plane rather than a competing protocol, the NAT-traversal story for each, and an honest decision framework for which to actually run.
Openvpn
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WireGuard vs OpenVPN vs Tailscale -
pfSense and OPNsense: The Complete Home Lab Firewall Guide A comprehensive guide to pfSense and OPNsense — comparing the two platforms, choosing hardware, installing and configuring from scratch, setting up DHCP, DNS-over-TLS, firewall rules, NAT, VLANs, WireGuard, high availability with CARP, packages like pfBlockerNG and Suricata, and hardening your router/firewall for the home lab or small business.