How to format disks on the server?

Question

System administration

The server has 2 ssds and 2 hdds
on one ssd is the operating system /dev/sda
the second /dev/sdb
hdd1 /dev/sdc
hdd2 /dev/sdd
how to format these 3 disks b -cd and then mount the hdd as partitions on /dev /sda and keep a copy of /sda in /dev/sdb

Answer 1

Format via mkfs.ext4 /dev/sdX
Mounting configure via fstab, Google is full of mans.

Answer 2

you can do this
apt-get install gparted
apt install gnome-disk-utility