Explanation:
Eye Contact is key. But don't stare
Table Manners : When dining, people consider it not nice for a guest or dining partner to burp , eat with an open mouth.
When you want to refuse something politely say, " No Thank You. "
When accepting say, " Yes Please. "
Always say thank you when someone helps you out ( common knowledge )
When entering/leaving : ( stores, etc..) When the staff or anyone say "Welcome" or "Hello" , always say "Hello" back or it will make you look like you are ignoring them. Same goes to when you are leaving :)
Phone Calls : this one is important because when someone calls you and you start talking loudly or put them on speaker in public, it looks r u d e to the people beside you. They don't need to know what your private life is. I've had this happen a couple of times and its very uncomfortable.