What cultural faux pas should I try to avoid making in Quy Nhon?

"When visiting Quy Nhon, it's important to respect local customs and traditions to avoid causing offense. Avoid public displays of affection, as they are considered inappropriate in Vietnamese culture. Dress modestly, especially when visiting religious sites, as revealing clothing is seen as disrespectful. Do not touch someone's head or pass anything over someone's head, as the head is considered sacred in Vietnamese culture. Avoid pointing with your finger, instead use your whole hand to gesture. It's also considered rude to show the soles of your feet, so try to keep your feet on the ground. When visiting someone's home, always remove your shoes before entering. In conversation, avoid discussing politics, the Vietnam War, or making any negative comments about the Vietnamese government or Communist Party. It's also considered rude to lose your temper or raise your voice in public. When it comes to dining etiquette, wait to be shown where to sit and do not start eating until the oldest person has begun. Chopsticks should be placed on the table or a chopstick rest after you've finished eating, not left standing in the bowl. Finally, bargaining is common in Vietnam, but do so with a smile and remember to be respectful. It's also customary to use both hands when giving or receiving something, especially money or a business card, as a sign of respect," remarked another expat in Quy Nhon, Vietnam.