Grains and carbs
Grains and other carb options make the bulk of our diets for many of us. That doesn't mean that we know all about them, though.
If you eat rice or quinoa a couple of times a week, you never store it long enough to start thinking about spoilage. The same thing is true for other grains.
The articles below cover storage, shelf life, and going bad of various everyday products. If you'd like to learn more about any of the foods, they should help you immensely.