When solving what problem can the Earth be considered a material point? And in solving what problem it cannot be considered a material point?
The Earth can be considered a material point, for example, when considering its annual motion around the Sun. When considering the motion of artificial satellites, the Earth cannot be taken as a material point.
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.