What can you learn from nearby ads?

You learn which shift and which dish are being shouted on the street, so you do not repeat them if they are not yours. You do not learn a trick: if they promise a price or a delivery you do not have, it is not copied. Save three ads from venues you could walk to. The hook is copied and on the floor that dish does not exist. Those three notes and the line of what you will not advertise.