What cultural faux pas should I try to avoid making in Muscat?

"It is important to be respectful of local customs and traditions when visiting Muscat. It is considered impolite to show public displays of affection, so it is best to avoid kissing or hugging in public. It is also important to dress modestly, as revealing clothing is considered inappropriate. Additionally, it is important to be aware of the local religious customs and to avoid eating, drinking, or smoking in public during Ramadan. Finally, it is important to be respectful of local customs and to avoid taking photographs of people without their permission," mentioned another expat when asked about moving to Muscat, Oman.