Etiquette abroad is a small set of repeatable rules

Local customs are usually presented as a long list to memorise. In practice a small number of variables account for most of the friction a visitor causes.

Volume is the most common mismatch

Acceptable speaking volume in public differs substantially between cultures, and it is a norm people are unaware of holding because it feels natural rather than chosen.

Trains, restaurants and residential streets are where it registers most, since those are the places with an expectation attached rather than merely a level of noise.

Matching the room rather than applying a home standard resolves it entirely, and takes only a moment's attention on arriving anywhere new.

Thresholds carry meaning

Removing shoes when entering a home, and sometimes a guesthouse, temple or restaurant, is common across large parts of the world and is about cleanliness rather than deference.

Where this applies, it is usually signalled by shoes already at the door, which is a more reliable indicator than any general rule about a country.

Head covering, shoulder covering and the removal of hats operate the same way in religious buildings, and are generally signposted at the entrance.

Greetings set the register for everything after

Whether a transaction opens with a greeting varies, and in places where it is expected, beginning with a request rather than a greeting reads as abrupt.

Learning the greeting, the thank you and the apology in the local language covers most interactions, and their effect comes from the attempt rather than the pronunciation.

Physical greetings vary more and are riskier to guess, so following the other person's lead is more reliable than initiating a handshake, a bow or an embrace.

Queuing and personal space are learned by watching

Queue discipline ranges from strict lines to a loose cluster where order is remembered rather than displayed, and both work perfectly well within their own convention.

Standing distance in conversation varies similarly, and adjusting to the other person's position rather than maintaining your own is the practical response.

Photography of people follows the same principle, since asking first is understood everywhere and the answer resolves a question that written guidance cannot answer for a specific person.

Observation beats research

Written guidance ages and generalises across regions and generations. Watching what local people of a similar age do in the same setting is current and specific.

Where a mistake is made, acknowledging it briefly and correcting it is almost always sufficient, since visitors are generally granted latitude they do not need to ask for.