Plan your weekly meals before you shop. I know, sounds like common sense, but I recently started. I keep our menu posted in our kitchen and it has been so easy to know what we are having each day. Now, I don't get stressed out wondering, what are we having for dinner tonight? Each day is planned out in advance.
It doesn't matter if you keep your menu posted on a chalkboard or posted on your fridge. Make your life easier. Plan ahead.