What cultural faux pas should I try to avoid making in Hoi An?

"In Hoi An, it is considered disrespectful to touch someone's head as it is regarded as the highest part of the body, spiritually and physically. Public displays of affection are generally frowned upon, especially between members of the opposite sex. It's important to dress modestly, particularly when visiting religious sites, as revealing clothing can be seen as disrespectful. When visiting someone's home, it's customary to remove your shoes before entering. Pointing with your finger is considered rude; instead, use your whole hand to gesture. It's also considered impolite to cross your arms over your chest. In terms of dining etiquette, it's considered rude to leave chopsticks sticking upright in a bowl of rice, as this is reminiscent of incense sticks burning at a temple and associated with death. Avoid discussing politics and the Vietnam War, as these topics can be sensitive. Always ask for permission before taking photographs of locals, especially the elderly. Lastly, bargaining is common in Vietnam, but it should be done in a friendly and respectful manner. It's important to remember that what might seem like a small amount to you could be significant for the vendor," mentioned another expat when asked about moving to Hoi An, Vietnam.