Short list to create an encrypted  partition on RHEL/Alma /Fedora

dnf install cryptsetup
fdisk /dev/sdb

cryptsetup luksFormat  /dev/sdb1
openssl genrsa -out /root/.keyfile 4096
cryptsetup luksAddKey /dev/sdb1 /root/.keyfile
cryptsetup luksOpen  /dev/sdb1 luks --key-file=/root/.keyfile  
mkfs -t xfs /dev/mapper/luks 
mkdir /a 
mount /dev/mapper/luks /a
df -h 

umount /a 
cryptsetup luksClose /dev/mapper/luks