Top 7 in Top 10 leading rules in Western high-end cuisine.
Unless you are aware of every guest at the table, you should not discuss politics, religion or sexuality at the table. You should also avoid any controversial topics that may be outside the scope of those three topics. Dinner means being enjoyed, not a forum for debate.
You should spend time equality for the person sitting on your left and right. It can be hard to talk to strangers easily, but it is imperative that you do the same so that everyone can participate in the conversation.
If you're not very confident in talking to others, a good rule is to ask the person questions about themselves (never a personal question). Everyone loves to talk about themselves and this will also make you seem to be a good listener.