Generally, the handshake is used to greet people. Although the majority of
locals speak English, Letzeburgesch is the national language of
Luxembourg. French and German are also spoken by many
Luxembourgers. When appearing as a guest at someone’s house, it's a
good practice to bring along a gift or flowers. People are expected to dress
in smart casuals, but it would be best to turn up in formals when attending
social functions or clubs. It’s not advised to smoke in public places.