The slowing down of Venus’s rotation could have occurred if we assume the existence of a massive satellite in its past, located in an orbit above the stationary one. In some hypotheses, it is believed that such a satellite could be Mercury. To spin the planet in the opposite direction, the satellite had to be in an orbit below the stationary one for some time.
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.