Final answer:
Tan's mother teaches the importance of listening to good morals, discarding hateful ones, and learning practical skills such as managing finances.
Step-by-step explanation:
The lesson imparted by Tan's mother can best be summarized as an encouragement to listen to the morals taught to her, to discard the ones filled with hatred, and to learn practical skills like how to count money. Tan's mother's advice represents a pragmatic approach to navigating life, emphasizing the importance of both ethical discernment and financial literacy. This passage suggests that while monetary management is essential, it is equally critical for one to grasp and adhere to positive moral values. This narrative underscores the challenges of economic constraints faced by many, highlighting the deep impact of upbringing and education in molding future generations.