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Longman Dictionary of Contemporary English
table manners
noun
EXAMPLES FROM CORPUS
▪ Are they conventional rules that we learn as we learn, say, table manners?
▪ Good table manners, I submit, are largely overrated.
▪ Perdita thought, to take an example at random, that things like table manners were a stupid and repressive idea.
▪ Since dress, gait and table manners instantly distinguish social rank, all over the world, why not speech as well?
▪ Their table manners perfectly reflect the slovenly appearance.
Wiktionary
table manners

n. 1 An accept code of conduct for behaviour at a dine table. 2 The manner of a behavior of an individual while dining.

Wikipedia
Table manners

Table manners are the rules of etiquette used while eating, which may also include the appropriate use of utensils. Different cultures observe different rules for table manners. Each family or group sets its own standards for how strictly these rules are to be enforced.