Check the embassy, consulate, or official immigration information for your nationality and travel purpose. Record the date you checked it and leave time for document correction.
Match the rule to your situation
Nationality, transit, previous travel, purpose, and port of entry can matter. Avoid relying on a general social post or a rule written for someone else.
Keep your documents easy to show
Carry digital and printed copies where sensible, including onward travel and accommodation information if required for your case.