There is a type of restaurant in the USA called a "Diner." A diner is a prefabricated restaurant, often with an exterior layer of stainless steel.
A short 5-10 minute walk from my room in the LaSalle Bed and Breakfast in Fort Wayne, Indiana is the Cindy's Diner. It is located on the corner of Harrison and Wayne, which is the center downtown Fort Wayne. It is open for breakfast and lunch from 6:00 AM to 2:00 PM.
How to learn the American culture? There is no better way to understand the American culture than to eat breakfast at this type of restaurant.