What is the significance of title The Goldfinch by Donna Tartt? I have read this novel and its awesome, but now I have to write 10,000 words on it. Which points should I discuss?

What is the significance of title The Goldfinch by Donna Tartt
What is the significance of title The Goldfinch by Donna Tartt? I have read this novel and its awesome, but now I have to write 10,000 words on it. Which points should I discuss?
What is the significance of title The Goldfinch by Donna Tartt