The opening paragraphs teach us a lot about Nick and his attitude toward Gatsby and others. Nick introduces himself to us as a young man from the Midwest who has come East to learn the bond business. He tells us that he's tolerant, inclined to reserve judgment about people, and a good listener. People tell him their secrets because they trust him; he knows the Story of Gatsby. If you read closely, you'll see that Nick has ambivalent feelings toward Gatsby. He both loves Gatsby and is critical of him. Nick is tolerant, but that toleration has limits. He hates Gatsby's crass and vulgar materialism, but he also admires the man for his dream, his "romantic readiness," his "extraordinary gift for hope."
Nick makes the distinction between Gatsby, whom he loves because of his dream, and the other characters, who constitute the "foul dust" that "floated in the wake of his dreams."
Nick has such scorn for these "Eastern" types that he has left the East, returned to the Midwest, and, for the time being at least, withdraws from his involvement with other people.
Having told us about his relationships, Nick now introduces us to the world in which he lived during the summer of 1999: the world of East Egg and West Egg, Long Island.
Fitzgerald designed The Great Gatsby very carefully, establishing each of the locations in the novel as a symbol for a particular style of life. West Egg, where Nick and Gatsby live, is essentially a place for the nouveau riche. There are two types of people living here: those on the way up the social ladder who have not the family background or the money to live in fashionable East Egg; and those like Gatsby, whose vulgar display of wealth and connections with Broadway or...