There are three knobs, one for time, one for temperature, and one to adjust the top and bottom tube heating.
I suggest the owner go to Betty's Kitchen, which is a great food forum. There is a board called: baking time. There are teaching to do pastry, oven dishes Oh
To how much time to twist to which, the temperature is also. Preheat is to put the food baked before a few minutes of air heating.
STAY ON is not timed, the switch is decided by you.
Cake, penultimate layer, bread, pizza middle layer. Chicken wings, meat, whatever is also the middle layer