When the ebonite stick was rubbed on the fur, it charged negatively, so the fur was positive. During friction, electrons pass from the fur to the ebonite stick. Therefore, now in ebonite there is an excess of electrons, in fur there is a deficiency. The fluffs will repel from the ebonite stick, because bodies with the same sign mutually repel each other.
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.