Social etiquette plays a big part when you meet someone for the first time. In the United States, the custom is to shake hands and say, "Hello," and "Nice to meet you," all done with a smile.
Americans enjoy holding social events in their homes. If invited to a dinner party, you should arrive no more than 10 minutes later than the indicated time. For more casual parties, it is fine, and often expected, that you arrive later than the start time.
When eating, Americans put their napkins on their laps when they sit down. Putting your elbows on the table is considered bad manners, as is talking with your mouth full and slurping your soup.
