When pulling the bowstring, the human hand deforms it, i.e. transfers potential energy to it. At the moment of lowering the hand, potential energy is converted into the kinetic energy of the string. When the arrow moves, a small part of the energy turns into heat (as a result of friction against the air), when it hits the target, the kinetic energy goes into the inner arrows and targets (they heat up).
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.