For baking in an oven, basically just put the food in. However, medium-sized ovens usually have three levels of height to choose from. As long as the upper and lower fire temperatures are not specified in the recipe, place the baking tray in the middle; If the heating temperature is high and the lower heating temperature is low, unless the upper and lower heating temperature of the oven can be adjusted separately, the upper and lower heating temperatures are usually added and divided by two at this time, and then the oven tray is placed on the upper layer, but it is still necessary to pay attention to whether the surface is too scorched.