Initialize a LUKS partition and the initial key slot (0) with a passphrase or keyfile. Note: this operation overwrites all data on the partition. More information: https://manned.org/cryptsetup-luksFormat.
cryptsetup luksFormat /dev/sdXY
cryptsetup luksFormat /dev/sdXY path/to/keyfile
cryptsetup luksFormat --label label /dev/sdXY