crossover

Hey! I have a hard time finding an answer to rather simple question. I want to connect (from Pop OS) to a Proxmox server using a crossover lan cable. Also share internet connection through it. How can i make that connection happen? (using GUI or netplan)

Sorry for a sadly elementary question, but I'm stuck. I just finished Proxmox installation. The system rebooted. I'm at a text screen that says, I gather that, while the screen seems to be inviting me to log in, it's just kidding - I have to log in from a web browser on another machine. And I...