To kill a mockingbird when the children go to the purchase theylearn more about cal what do they learn?

The children learn that Calpurnia is able to know the differences between the black and white communities and fit into both.

Explanation:

Calpurnia wouldn't allow anyone to intimidate her because she brought the Scout and Jem to church, Cal had been taught to read. These things were all revelations to the children and therefore Scout wanted to spend more time with Calpurnia in her own home environment