What are the four methods of cooking with fat?

The four methods of cooking with fat are frying, sautéing, deep frying, and roasting. Frying involves cooking food in hot fat, typically oil, resulting in a crispy exterior. Sautéing uses a small amount of fat over relatively high heat to quickly cook food while retaining moisture. Deep frying immerses food completely in hot fat, creating a crunchy texture, while roasting involves cooking food in an oven with fat to enhance flavor and browning.