How to SSH Properly
 - Use Ed25519 keys. They are now supported in pretty much every server out there (all recent OpenSSH versions, GitHub, GitLab, etc). RSA 2048 keys are unbreakable for the foreseeable future, and using 4096 bit keys are just being paranoid with no gain. You can fit 4x Ed25519 keys in a tweet.- Setup and use ssh-agent. They make the life so easy.- You can use Yubikey and pretty much every other solution out there with with OpenSSH now.