Plan meals, don't just go get food and then put it together. By thinking about meals in advance you get a healthier diet and by only buying what you need for meals you waste less food and money.
The basis of eating heath is to cook from scratch so there's no crap in your food. Plan lunch and dinner around carb (preferably whole grains), veg and protein. Snack of fruit and healthy fats.Other than that (and the obvious like don't deep fry everything) it's all just personal taste so pick some meals you like. If you don't know meals then google some recipes and start learning.
For breakfast just don't have a fry up or sugar-y cereal, every other typical breakfast food is fine. Consider adding fruit if you don't snack on it.
There's really just not much use in people giving you a list of healthy foods to buy.