If you're just figuring this thing out, you should probably start with a good guide.
Go to nostr-resources.com →Create an RSS feed with posts matching a keyword, and use your favorite app to read new posts.
Discover RSS feeds →Here you can purchase a nice name@nostr.band alias for your Nostr pubkey (NIP-05 identifier).
Get a NIP-05 name →Check the real-time network statistics and graphs that Nostr.Band is collecting.
Check out Nostr stats →