Encrypt your drives

Encrypt your drives

But find a better guide. This one will damage your SSD
How? I've been using it for years.
Never use shred on a modern system. It is always ineffective, and in the case of SSDs can damage them (not just wear, but fills the disk to the max).
If you don't mind an attacker knowing how much free space you have, ideally you should also enable discards in luksOpen (check out the persistent setting) and mount.
Much appreciated, the guide is old.