According to Ampere’s hypothesis, a lot of closed circular currents constantly flow in bodies of iron, steel, etc. Each such current creates a weak magnetic field, that is, there are always many extremely small elementary magnets in the body. In a non-magnetized body, elementary magnets are located chaotically, and their fields cancel each other out. Such a body has no magnetic field. When the body is magnetized, the elementary magnets are oriented in one direction, the body becomes a magnet.
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.