I have quite a few keys. The one you probably want is my
communication ECC key.
Communication Keys
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.
Identity Keys
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.
Other Keys
I have a few other keys for mainly personal use, but they may end up being useful. The only key accessable to me on my phone is the 2048-bit one on my yubikey.