Are there any idioms about civilized dining?

Chew carefully and swallow slowly.

Lift the tray flat with your eyebrows ―― Husband and wife treat each other with courtesy.

Kong Rong gave up the biggest pear.

Leave the seat on the left vacant and wait for the talented person-leave this glorious position to the truly capable person.

Politeness three first

The benevolent loves others.

A loving father, a loyal son

Modest and courteous

help others

Reserve a seat for sb.

Politeness demands reciprocity.

Elegant and polite

Amiable and accessible.

Respect the elderly and take care of the children.

(of married couples) respect each other as if they were guests.