In a town nearby me (not really near me but within an hour's driving distance), sometimes I will see old people selling fresh fruit/vegetables in their front yard. They typically take cash, Cashapp, or Venmo. It's super convenient to be able to use Venmo in that situation. These are people I haven't met before.
I usually pay with cash. As a nice bonus, cash works even if there are mobile Internet shutdowns or blackouts and they cannot block the cash in your wallet unlike a bank account.