Placing parchment paper in the air fryer basket before adding whatever food you are going to cook is a Godsend. Parchment paper is nonstick so there is no need for cooking spray or oil. It's also easy to clean up, just pick the parchment paper out of the air fryer basket and toss it in the trash can. Just make sure to buy the parchment paper with holes in it so the air can flow through to still be able to cook the food and let the air fryer unit work properly.  Air fryers are great for reheating leftover foods. The food comes out crispy, not soggy.  Keep your air fryer in a space of its own giving it plenty of room for adequate airflow in and around it. They say about 5 inches all around it.  Always clean up the basket and surrounding area inside of the air fryer after cooking each batch of food.  Don't cram food or overlap, put food in a single layer.  Use heat-resistant tongs when flipping food items over in the basket. The food is HOT, you don't want to burn yourself.  The fan inside the air fryer can blow lightweight foods around such as the top slice of bread on a sandwich. To solve that problem, you can use a wooden toothpick inserted into the bread to hold it down.