Seating and sitting position

Top 3 in Top 12 Code of Conduct on Vietnamese dining tables.

Usually, if you are dining with your parents, older people or your superior, then you should let them choose a seat and invite them to eat in advance. Choose a place or forget to invite the opposite person to represent a lack of respect.
You should also not take overly relaxed or unreasonable fit when chatting with them. Today when eaten, people usually put elbows on the table, but the former is only allowed when you take the dishes.