The problem with the internet is that it's getting more and more complex, and breaking compatibility with the simpler stuff has become the norm.
I use Nostrudel.ninja, by the way. Nice simple client.
Discussion
Big. Error message for me. 😢
I don’t understand everything. Or anything. Isn’t each relay just a group of people?
Relays are like postal services that make copies of your messages and distribute them when your followers ask for them.
They also give you copies of messages they got from people you follow.
In other words, they are public postal services.
Ironically, it's more similar to postal services than "email" (you don't need "user and password" to send/receive physical mail).
And clients are like typewriters. Apps like Damus, Amethyst and Nostrudel are "clients".
So, when you communicate through Nostr, you're communicating with the world, or at least the portion of it that you follow/follows you.