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

"It is important to be mindful of cultural differences when visiting Montreal. It is important to be respectful of the French language and to avoid speaking English in public places where French is the primary language. It is also important to be aware of the local customs and to dress appropriately for the occasion. Additionally, it is important to be respectful of the local Indigenous peoples and their culture, and to avoid making any insensitive comments or jokes. Finally, it is important to be respectful of the local laws and regulations, and to avoid engaging in any activities that are illegal or considered inappropriate," remarked another expat who made the move to Montreal, Canada.