What was the point of juxtaposing chapter 10 and chapter 11 of To Kill a Mockingbird?the juxtaposing part... when ch 10 ends w/ scout and jem being...

At the end of Chapter 10, Scout and Jem are proud of their father, but not for the right reason; they are proud of him because of his prowess as a marksman, which says nothing of his character or morals.  Though Atticus did exhibit what his children perceive to be courage, he was actually only doing what was required of him and using a weapon to do so.  He was in little or no actual danger when he shot the dog.

In Chapter 11, Scout and Jem learn a valuable lesson in true courage.  When Atticus explains to the children that Mrs. Dubose faced her "demon" of her own will and overcame her addiction to morphine despite very real pain, Scout and Jem come to appreciate that courage means facing a situation in which there is no predetermined victor and in which real risk is present.

Juxtaposing the two chapters allows Harper Lee to present a clear contrast of real courage versus what the children mistakenly believed to be bravery.  The message, or lesson, would not have been as obvious and powerful without that juxtaposition.