If you buy a new oven, you can't bake the ingredients right away. You must pretreat it first. Wipe the inner wall of baking tray and oven with cleaning cloth and detergent first, and then scrub with clean water. After scrubbing, when the water stains are dry, adjust the temperature to the maximum, for example, the highest temperature of the oven is 250 degrees, which can be adjusted to 240 degrees. Set the baking mode to copy the upper and lower tubes together. Set the baking time to 15 minutes.
If you want to bake cakes, bread, pizza, etc. Or you are sure what to do when you buy an oven, or you are skilled in using an oven, I suggest you buy an oven with functional capacity and waste it idle.