Oven Do's and Don'ts when Baking

Do preheat the oven 10 minutes before baking.
Do put the oven rack at the center of the oven for proper heat distribution .
Don’t let the pans touch the sides of the oven or touch each other .
Don’t put the pans one on top of the other when baking with two racks . Stagger them so heat will circulate.
Don’t open the oven door until at least half of the baking time has passed.