What cultural faux pas should I try to avoid making in Ha Long?

"When visiting Ha Long, it's important to respect the local customs and traditions to avoid any cultural faux pas. Dress modestly, especially when visiting religious sites, as revealing clothing can be seen as disrespectful. Avoid public displays of affection, as they are considered inappropriate in Vietnamese culture. Do not point with your finger, instead use your whole hand, as pointing is considered rude. Similarly, avoid touching someone's head or passing anything over it, as the head is considered sacred. When dining, wait to be shown where to sit, as there may be a specific seating arrangement. Also, try to finish all the food on your plate as a sign of appreciation for the meal. Avoid discussing sensitive topics such as politics, the Vietnam War, and criticism of the government. It's also considered rude to lose your temper or show frustration in public, so try to remain calm and patient in all situations. Remember to always ask for permission before taking photographs of people, especially monks and older people. Lastly, bargaining is common in Vietnam, but do it respectfully and with a smile," remarked another expat who made the move to Ha Long, Vietnam.