Etiquette for meeting people and eating

I have lived in China for almost two years. Here is what I know:
Meeting and greeting people: it is suggested not to wear too casually when meeting someone. When greeting, you'd better look into their eyes, or it is impolite behavior. Chinese people greet by shaking hands, especially between men and for business purpose.

Eating: If you eat in a family, don't feed youself until all members are seated. And when the host add food to your bowl, don't refuse them too directly. When eating out, say in a restaurant, there seems nothing that needs to be observed.