You don't need to keep too many ingredients on hand to bake at any given time.
Yeast is the heart of the breadmaking process.
It's the essential ingredient that makes the dough rise and gives home-baked bread its wonderful taste and aroma. Other ingredients are added to complete the reactions that result in a perfectly baked loaf of hot, crusty homemade bread. In each yeast envelope, there are thousands of living plant-like microorganisms. When activated by warm liquid, and fed by sugar or starch, the yeast releases tiny bubbles of carbon dioxide gas. This gas is what makes the dough rise and achieve its light texture after baking.