This post will be mostly about food etiquette. There will be a later post about Chinese etiquette in general.
In Western culture, we normally put our young first before the elderly. In Chinese culture, it's the other way around. We put the elderly before anyone else. The way we see it is that: older you are, the wiser you are, therefore, you deserve more respect. In Hong Kong, we normally eat dimsum for lunch and family style with the Lazy Susan for dinner.