Answer:
Before you bake something, your oven needs to be heated to the proper temperature. While it takes only a few seconds to turn on your oven, it can take several minutes for it to reach the right temperature. It is often best to turn the oven on during the beginning or middle of the cooking process, instead of waiting until the end.
①Open the oven to make sure everything has been removed. Some things often left in ovens are baking trays and leftover dishes.
②Rearrange the shelf levels. Put the oven shelves into the position that you need them to be in for the cooking before the oven gets hot
③Check the preheat level required by your recipe. Turn on the oven and set it to the correct temperature.
④Wait until the oven reaches the desired temperature before placing food inside