QUICK INFO:

• Applications"  > "Utilities" > "Disks" > select drive > click on the three  vertical dots icon > "Format Disk..." > select preferred options,  then "Format..." > "Format" > "+" to add partition > choose  dimension of partition > "Next" > provide the name of the volume  in the relative field > select if you want to overwrite data (more  secure but much, much slower) > select "Internal disk for use with  Linux systems only (Ext4)" > tick "Password protect volume (LUKS)"  > "Next" > provide encryption password > "Create