Using the right kind of fat for different types of frying will make whatever you cook more delicious.
Generally, the higher a fat’s smoke point _ the temperature at which the fat goes from hot and shimmery to smoky and acrid _ the more versatile and durable it is as a frying medium. A wisp of smoke is fine before tossing ingredients into a wok for a stir-fry or skillet for a sear, but a plume rising from the pan means the oil is burning, and the taste of burnt (not browned or toasted) fat is rarely what we’re looking for in the kitchen.
To figure out which fat I want to use for which frying job, I think of them in these categories:
Low to medium heat: butter (fresh and clarified) and usli ghee