You should start learning basic PGP encryption.
Discussion
How do I get started?
I learned by watching this.
https://youtube.com/playlist?list=PLOZKbRUo9H_pCTg8XdvkyGZ_lJbl1AA5X&si=styegr0qn0Fz5zZe
If you have Android, this is also useful.
If you can spare the sats, I got a yubikey.
Then did this.
https://support.yubico.com/hc/en-us/articles/360013790259-Using-Your-YubiKey-with-OpenPGP
