To begin with, we have conduction. Conduction is when heat transfers through direct contact of particles.
the fork is touching the fire and it's absorbing the heat from the fire.
Next is convection. Convection is circular patterns of heat transfers, only with liquids and gases.
The heat is rising up until it cools back down.
The hot air rises up and the cool air goes down.
Finally there is radiation. Radiation is heat transfer through electromagnetic waves.
The campfire heat is giving off radiation that transfers to the camper's hands and warms them.
The air from the dryer gives off heat into your hair
The sun is giving heat to keep the guy warm.