What do you mean by breaking in Black beauty?

"Breaking in" in the context of "Black Beauty" refers to the process of training a horse to accept a rider and perform under saddle. In the story, this often involves harsh and cruel methods that reflect the mistreatment of horses during the Victorian era. The protagonist, Black Beauty, experiences both gentle and brutal training techniques, highlighting the importance of kindness and understanding in the relationship between humans and horses. This theme underscores the broader message of compassion towards animals throughout the narrative.