are there three lightness, four diligence, five tones and five hearts in catering service?

did you do it as a waiter?

Three lightness: speaking lightly, walking lightly and operating lightly

Four diligence: eye diligence, mouth diligence, hand diligence and leg diligence

Five tones: welcome, greeting, thanks, apology and farewell

Five hearts: patience, caring, carefulness and enthusiasm.