a) Decrypting Partition
In this example, the /dev/sda device has the partition /dev/sda1 which is LUKS2-encrypted. Now, decrypt it. You will be prompted to enter the passphrase.
sudo cryptsetup luksOpen /dev/sda1 Target_Name
The target can be named anything.
b) Creating Mount Point
Create a mount point by either:
sudo mkdir /run/media/$USER/ and
sudo mkdir /run/media/$USER/Mount_Point
or:
sudo mkdir /mnt/Mount_Point
c) Mounting Partition
sudo mount /dev/mapper/Target_Name /run/media/$USER/Mount_Point
or
sudo mount /dev/mapper/Target_Name /mnt/Mount_Point
d) Fixing Permission
If you are unable to access the mounted partition, you can try the following approach, although it may be a bad practice.
sudo chown -R $USER /run/media/$USER/Mount_Point
or
sudo chown -R $USER /mnt/Mount_Point
Enjoy encryption!