I have quite a few keys. The one you probably want is my communication ECC key
These keys are for signing daily messages and communicating with me. I have RSA and ECC variants. Use ECC if possible, but you can't with old gpg versions.
I also frequently use my yubikey for signing and authentication.
These keys are signing-only and kept offline. They sign all of my other keys, and will be used to sign your key, and should be used if you are signing my keys.