This is pretty amethyst specific so some parts may be irrelevant, but the general concept of outbox(write) and inbox(read) should apply, regardless of client. You can look for different relays to connect with at nostr.watch and easily manage your relays at metadata.nostr.com

nostr:naddr1qq9hyetvv9uj6um9w36hqqg4waehxw309aex2mrp0yhxgctdw4eju6t09upzq3svyhng9ld8sv44950j957j9vchdktj7cxumsep9mvvjthc2pjuqvzqqqr4guf00myv