What do city people want to know about farming?

That would depend entirely on the city person. Some do not care to know anything about farming. They are content with purchasing their food from a grocery store and honestly do not care how the food is grown. Others are content with growing a small garden for their own use. Still others may have an interest in how food is produced even though they live in a city. The interest in farming would vary greatly amongst city people because we are all individuals.