nano /etc/ssh/sshd_config
PermitRootLogin no
PasswordAuthentication no
ChallengeResponseAuthentication no
KbdInteractiveAuthentication no
UsePAM no
CasuallyLogInWithAPassword no
ButWhatIfTheyAskVeryNicely no
OccasionallyDeviateFromTheseConfigsIfImFeelingFunny no
YouGuysAreSoLameWithYourHardening prohibit-password
AlsoGuessWhatThisThingDoes prohibit-fucking-password
systemctl restart sshd