Copy the Proxmox ISO image on a CD/DVD or a USB flash drive. Although both options are possible, it is assumed that most systems don't have an optical drive.
Plug in the USB drive and copy the ISO image to the USB stick using the command line or a USB formatting utility (such as Etcher or Rufus).
Note: Back up and remove any data on the device as the process will erase any previously stored data.
If you are working on Linux, the fastest way to create a bootable USB is to use the following syntax: