Lightning is the payment rail that sits on top of bitcoin and allows near instant payments between people - a lightning wallet allows you to receive bitcoin over the lightning network, which is how people reward eachother for creating great content on here.

There are a number of options with various trade offs - nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5 and nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm are great options, less popular these days perhaps, but still a quick easy entry point is Wallet of Satoshi