What is the meaning of the law of conservation of energy?

With any interactions of bodies, energy does not disappear without a trace and does not arise from nothing. Energy is only transferred from one body to another or transforms from one form to another.

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.