Thanks, Denice!
Cone offsets allow you to adjust the temp for any cone. So for instance if you notice it's firing too hot at cone 6 but not at cone 04, you adjust the temp for cone 6 without affecting any other cones.
Thermocouple offsets allow you to individually adjust the thermocouples if it's firing too hot or too cold at all temps, or if you notice that one section of the kiln is firing too hot or too cold. Larger kilns often need the bottom thermocouple adjusted to prevent the bottom from running cold.