Learn how to configure your Proxmox server with SMTP details through the Proxmox web UI, so that it can send email notifications for things like backups failing.
Learn how to configure the root user's email address so that they receive important notifications.
Learn how to deploy a Debian 12 LXC container on Proxmox.
Learn how to create "full clones" of virtual machines in Proxmox, when they are configured to use ZFS storage.
An example network config for Proxmox, which makes use of vLANs so I don't forget and have something to refer to.