What English communication should I learn as a waiter in the lobby bar of a five-star hotel? What should I pay attention to?

Just learn five languages! ! What matters is English! Korean, Japanese, French and Chinese! Also note: make it clear when guests ask! When a guest says thank you, he says you're welcome. This is what we should do or be careful! Take your time! When people leave, they should say: Welcome next time, and wish you a pleasant stay! !