Keep the beer in the refrigerator, preferably at the recommended temperature indicated on the product.
Beer needs to be taken care of even when you leave the factory gates. The best way to preserve its quality is to look for a place for it in your fridge right after the purchase. You should also put it in if you plan to consume it only in weeks or months. You don't leave milk outside at room temperature either, do you ?! Think of your beer the same way. If you want to preserve its taste and avoid oxidation, store it at the temperature indicated on the product until it is time to take a sip.