You do not need to memorise a long rulebook. A few basic habits around temples, homes, photographs and shared meals are enough to make most interactions easier.
Keep interactions warm and respectful
Vietnamese social etiquette places value on politeness and avoiding unnecessary embarrassment. A calm tone, a smile and a little patience usually go a long way, especially when language is limited.
Temples and places of worship
Dress more conservatively when visiting temples and religious sites. Follow posted instructions about footwear, photography and restricted spaces, and avoid treating altars or sacred objects as photo props.
Homes and personal spaces
If you are invited into a home, watch what your host does with footwear and follow their lead. Greet older family members respectfully and avoid stepping over household altars or offerings.
Photography
Vietnam is extremely photogenic, but people are not scenery. Ask before taking close-up portraits, especially in rural communities, markets, religious sites or private homes.
Dining and shared meals
Many Vietnamese meals are served family-style. Pass shared dishes carefully, wait for the group when appropriate and take modest portions first. If a host keeps offering food, a friendly and repeated 'no thank you' is fine when you are full.
A few useful words
Simple Vietnamese phrases make interactions friendlier. 'Xin chào' is hello and 'cảm ơn' is thank you. Perfect pronunciation is not expected; the gesture itself is appreciated.