What is a NIP-05? #[0] got some great info on that in one of the guides, you should check them out!

NIP-05 is a verification method for your Nostr account across all clients. Think of it as the blue checkmark on Twitter or Instagram, but instead of meeting Twitter and later Instagram’s requirements to be verified, you can simply do it yourself, and Nostr clients will respect it.

Setting up your own NIP-05 is a great learning process to do!

Dont have a domain, dont know how to do it or just dont want to do it yourself? I'll add one for ya, for free, just reply the name you want and i'll add you to Nostr-Check.com!