Heat transfers in three primary ways: conduction, convection, and radiation. Conduction is direct heat transfer through physical contact, common in solids like a metal spoon in hot soup. Convection is heat transfer through the movement of fluids (liquids or gases), where warmer, less dense fluid rises and cooler, denser fluid sinks, creating a continuous flow, as seen when boiling water. Radiation is the transfer of thermal energy via electromagnetic waves, which doesn't require a medium, like the sun's heat reaching Earth. All three methods can be observed simultaneously in a fireplace, where the grate heats by conduction, the rising air warms the room by convection, and you feel the warmth from across the room via radiation.