The introduction to Gatsby is important because he is one of the main characters, and helps build the storyline. Gatsby is the focal point of the main plot, the American Dream that everyone wants. Gatsby is a very suspicious and kept man, nobody really knows who he is. He doesn't drink or talk much. He is just. There. 'Gatsby believed in the green light, the orgastic future that year by year recedes before us."
Gatsby throws the most extravagant parties with the most extravagant people. We learn later on in the story that Gatsby throws these parties in hopes of Daisy coming back to him and leaving her home and life behind. The people here know nothing of Gatsby or what he does and especially who he is. "people were not invited-they went there... sometimes they came and went without having met Gatsby at all..."
the burial and funeral of Gatsby is one of the most significant parts of the entire story because this is when we really see the fall and failure of the american dream appear. Gatsby symbolizes the american dream, the death of Gatsby shows us that sometimes it doesn't really work. All of the people that came to his house didn't care about him, even the people he considered "friends" didn't show up.