Being able to type in the (limited) ingredients you have into Google and getting a recipe for a pretty tasty dinner :)
Domestic goddess styles.
Always have the basics:
Olive oil.
(Only buy virgin don't mess about with anything else, like "cold-pressed" it's all nonsense and means it's been filtered using chemicals).
A decent range of herbs and spices, or basically, oregano, basil, chilli flakes, rosemary, salt, pepper, coriander - all essential, fresh better
Garlic can be the crushed variety
Pasta/spaghetti
Cans of tomatoes
A couple of cans of Cannellini, chick peas and kidney beans
Flour, and some dried yeast.
Cheese
With that you can make a meal fit for a king.