Comment by gkbrk

But that's essentially the whole protocol. You can implement a client or a server reading only NIP-01 and it will be able to interoperate with the rest of Nostr.

Reading and implementing NIP-01 can be done in an afternoon (or a weekend if you're taking your time), and it gets you relays that can accommodate multiple clients and applications. From the client perspective, only implementing NIP-01 gets you a simple Twitter clone with an identity that belongs to you.