Rotation is honestly the most important thing I learned the hard way—it's so easy to forget what you have tucked away if you don't keep a list or some kind of inventory. I do “first in, first out” with a simple notepad and masking tape labels. For staples, I started with white rice (cheap, long shelf life) and dried beans, then added canned tomatoes, corn, and even boxed milk. I’ve found the store-brand canned meats like chicken or tuna last surprisingly well and add variety.
Mylar bags with oxygen absorbers (and double