cereals, breads, pizza, wheat..etc
A grain crop. Wheat is actually a type of grass, though a much different species than that you use for your lawn.
A cash crop would be something like cotton, soy beans or tobacco. A food crop would be wheat, corn etc. soy beans are used to extract soy oil / soy sauce which is sold in the market and not consumed...
It is like fertilizing the soil, but you just rotate the crops to avoid using up the minerals.
legumes
Visiting the Field of Dreams
Growing Organic Seeds and Grains
Very Particular Produce
Riceland Foods' Rice Production