Organic? Fresh? Whole? What is actually Healthy Whole Foods?

So many of us take one or two days to cook and prep meals to eat throughout the week. But, what are we cooking and eating? Is what we prep the best for our bodies? What defines (to you) healthy whole foods? Is it organic, grass fed or is it the cheapest from bulk? How and what to you buy to eat?
You can get organic, grass-fed, AND bulk at Costco 👌🏻