Since the Moon makes one revolution around its axis relative to the direction to the Sun in a synodic month equal to 29.53 days, at any point on its surface the Sun is visible above the horizon for about two weeks, and it is not visible for the next two weeks. But the Earth is constantly visible only from one hemisphere of the Moon (we call it “the visible side of the Moon”), and from the other hemisphere (“the reverse side of the Moon”) the Earth is never visible. (There are also small areas where, due to librations, the Earth rises and sets beyond the horizon of the Moon.) Therefore, the Earth is more often visible on the visible side of the Moon, and the Sun on the invisible side.
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.