Do greet people warmly and with a smile. A firm handshake or a kiss (3x) on the cheek is common when meeting someone for the first time.
--randjelovic
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when invited to someone's home, it's good to be punctual and bring a small gift like flowers or sweets as a sign of appreciation.
--randjelovic
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Serbs are friendly and open people, but showing respect, being polite, and following basic social norms will help you feel at ease and help you build good relationships with locals.
--randjelovic