This is my running list of frequently used commands that are useful in the Proxmox shell.

pveam

LXC containers can be installed using templates.

Get the list of available templates.

pveam available

Search for what you need.

pveam available | grep ubuntu

Download what you need. Replace local with your preferred storage.

pveam download local ubuntu-20.04-standard_20.04-1_amd64.tar.gz

lxc containers

List your containers.

pct list

Search for what you need.

pct list | grep caddy

Enter the shell of your container.

pct enter 100

webgui

Restart the webgui.

service pveproxy restart