Integrating OpenSSH with Secure DNS
cool idea for retrieving an public key for a host via DNS instead of just trusting it like we usually do
Top 20 OpenSSH Server Best Security Practices
How to use FIDO2 USB authenticators with SSH - Stavros' Stuff
It's Now Possible To Sign Arbitrary Data With Your SSH Keys
"But that will soon change in Git 2.34, which adds support for SSH signatures"