Linux Shout published a tutorial about creating a Proxmox bootable USB drive for installation.
How to create Proxmox bootable USB drive for installation
In this tutorial, we will learn the steps to create Proxmox Virtualization bootable USB drive on Linux, Windows, or macOS to install it on a Server, PC, or Laptop for creating virtual machines.
How to create Proxmox bootable USB drive for installation - Linux Shout