"I was only sent to perfect good character."
— Prophet Muhammad ﷺ (Ahmad, authenticated by al-Albani)
Islamic etiquette (Adab) is not a set of rigid rules but a reflection of the Prophet's ﷺ character. He was described by his wife Aisha (RA) as having the Quran as his character. These manners are acts of worship that bring us closer to Allah and make us better human beings.