If you're just authenticating to a Linux server you control, we'd recommend using FIDO2, although there are other options. PGP keys can be generated on your YubiKey and used with OpenSSH ...
The YubiKey 5C NFC and its YubiKey 5 series siblings are the most capable keys available. This key supports the most commonly used FIDO2/WebAuthn and FIDO U2F protocols, and it also supports ...