Go to  nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 or  nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm or  nostr:npub1hcwcj72tlyk7thtyc8nq763vwrq5p2avnyeyrrlwxrzuvdl7j3usj4h9rq and grab a quick lightning address and paste it into your zap settings. You'll very quickly get your first sats (bitcoins) if you've never done so before.

All of the above are custodial, so after you start a small collection and realize how valuable they are, you can look into something like  nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg or  nostr:npub1ajlrwgfj4yerhqf7ady03h7wmtk2qr3gs7h3sxcx83k05yld36sswpzx3q and start down the rabbit hole of using lightning with your own keys, cold storage, and all that jazz. 

That's for another day though, just grab a lightning address and I'll bet sats will start flowing in. Welcome to Nostr!