ss88us From one idea to a better one ;-) Thanks Steven!
@Adam You understood perfectly ;-) I didn't realize the security risks you mentioned. Some do it (like RC), but that's because they host everything and handle security.
Adam, Thanks for your message. I removed the password login successfully. However, even when I restart SSH, it keeps asking the password. sudo systemctl restart ssh.
@MediaServe Thank you very much! Btw I checked your website and what you do. It looks fantastic.