Use your freezer
Food can technically be stored in the freezer forever. When buying food in bulk such as bread why not consider freezing half of it and toasting it another time from frozen.
If you cook a large portion of food why not freeze the extra portion so that you can save yourself time later?
Choice of bags
Try to use freezer bags rather than storage bags as freezer bags are thicker. Thicker bags will keep the food fresher for longer.
Cool your food
Make sure you leave foods to cool before putting them in the freezer. If food is still hot it could cause other foods already in the freezer to defrost.