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

"It is important to be respectful of local customs and traditions when visiting Cairo. It is important to dress modestly, especially when visiting religious sites. It is also important to avoid public displays of affection, as this is considered inappropriate in the local culture. Additionally, it is important to be aware of the local laws and customs regarding photography, as taking pictures of certain sites or people may be considered offensive. Finally, it is important to be respectful of local religious beliefs and practices, and to avoid making any comments that could be seen as disrespectful," said another expat in Cairo, Egypt.