Note: I am just beginning to learn the ins & outs of LXC containers.

So far, LXC containers are just like regular Linux (for the most part...) & the same procedures apply when building.

Building a Container

Templates

LXC Containers start with a template.

For our example here, we're going to start with a basic Debian 11 template.

This means we need to ensure we have the template on the PVE host.

Sign into the PVE UI & select your Local datastore
Select the CT Templates storage
Click the Templates button
Select a template package (we're going with debian-11-standard) then hit the Download button

ping: socket: Operation not permitted

Discussion & a solution

Solution #3 seems most appropriate...