The fastest way to learn how to build a grocery list is to stop writing it as a list of foods and start writing it as a map of the shop. Group everything by the section it lives in — produce, dairy, meat and fish, dry goods, frozen, household — and you walk the store...
If you want to know how to read a nutrition label quickly, read it in this order: serving size first, then the ingredient list, then the panel numbers, and ignore the front of the package entirely. The front is marketing. The back is regulated. Those two facts do most...