Do I have to use oil when cooking with a frying pan?

pu1. If it's not fully cooked, that's how I do it

2017-12-12

OK

pu2. You don't need to use oil when you heat it up. Otherwise, it's good to use it so that the food doesn't stick to the floor

2017-12-12

OK

pu3. It's coated on the top of the frying pan, but it can burn the coating itself, so it's better to use oil

2017-12-12

OK