Five key points

It is pretty difficult to break them down into just five points. Do you mean in terms of theme? You might consider:

-Chris rebelled from a culture of materialism.

-Chris was devastated to find out his father had an affair.

-Chris wanted to "live deliberately" like his literary heroes Thoreau and Emerson.

- Chris finally discovers, too late, that he does need people and a little stability in his life.

-Chris lso discovers he was in over his head when surviving in the Alaskan wilds.