How to Harden Hetzner

More security on your server, how?

https://www.reddit.com/r/hetzner/comments/k5eywt/my_servers_keep_getting_hacked_im_desperate_for/

Start with login via keys, not passwords.

https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-linux-server

But note, don't create RSA keys, which have some vulnerability.