Etikette Anglais:

Do you know about mobile phone etiquette?

It's a matter of etiquette.

One should know dining etiquette to behave properly at the table and eat in company

Check the etiquette for the ingredients.

These days, being on your phone while having a conversation with someone is considered to be bad etiquette

It is not etiquette to do so.

She was dismayed at their ignorance in etiquette.