To prevent your flour from spoiling (including gluten-free flour!), store it in an airtight container or bag. This could be something as simple as sliding your bag of flour into a large resealable bag or a Lock-Top Flour Container — anything that adds layers of airtight protection. Then, keep it in a cool, dark place, since warmth and light speed up the spoilage process. For long-term flour storage, keep it in your freezer to extend its shelf life.
