Let your characters talk to each other and do things. Spend time with them - they'll tell you who they are and what they're up to.
Greta GerwigI didn't know the city at all, but I was so happy to be in New York I cried. I was so excited.
Greta GerwigWe would go down to Riverside, California, which is very poor now, but that's where my grandfather grew up. He grew up during the Depression in Riverside.
Greta Gerwig