The Catcher in the Rye chapter 3-6

Now that I am a couple chapters into the book, I am able to get a better understanding of who Holden is. At first, Holden seems like a person with no morals or values because of his uncaring attitude, but there are some good characteristics he's shown. For instance, Holden isn't always so cold and brutal towards everyone, but tends to show a childish side of himself occasionally. On page 29 it says, "I got bored of sitting on that washbowl after a while, so I backed up a few feet and started doing this tap dance, just for the hell of it. I was just amusing myself." Also, Holden may think rudely towards people, but speaks with a certain degree of kindness and regard for that person. That was something I didn't expect because of the way Holden thinks, and even when he spoke with Mr. Spencer, he showed a certain amount of courtesy. Conecting back to my questions from chapter 1,"What was Holden's childhood like?", Holden talks about his dead little brother, Allie, who clearly has a close place in his heart and his older brother, D.B., who he has drifted apart from.

What's the importance of all the small moments mentioned in the book?

How did Allie's death affect/change Holden?

*Disclaimer: Boys are savages