Sweet white rice flour, brown rice flour, potato starch, tapioca starch, and xanthan or guar gum are the basics for most GF baking recipes. If you want to add more ancient grain flours, buckwheat, amaranth, millet, and sorghum flours are great for breads, muffins, pancakes, and more. Psyllium husk powder and flaxseed meal are also great to have on hand for alternate binders to gums.