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

"It is important to be aware of cultural differences when visiting Moscow. It is important to be respectful of the local customs and traditions. It is important to dress modestly and to avoid public displays of affection. It is also important to be aware of the local etiquette when it comes to dining, as it is considered rude to start eating before the host does. Additionally, it is important to be aware of the local language and to avoid speaking English in public, as it is considered impolite. Finally, it is important to be aware of the local customs when it comes to gift-giving, as it is considered rude to give an expensive gift to someone you do not know well," remarked another expat who made the move to Moscow, Russia.