If you must swear in Quebec you should know that instead of swearing by sex and excrement, the quebecois swear by religion.
The most famous of such jurons¹ is Tabernac! (tabernacle or church) followed by Crisse! (Christ!), Câlice! (communion chalice) and d'hostie or variants (of the host). Alternate spellings (tabernak) are common as the tradition is largely verbal.
Finally, keep Désolé! (sorry!) in your back pocket in case you overstep yourself!
1. swear words