And, obviously, there were a bunch of helpful responses:
2. "Don't underestimate the wildlife. Deer can attack w deadly results and raccoons have sharp teeth, claws and opposable thumbs. Think of them as 10–20kg bears that can grab your face."
4. "Don’t say nothing when you enter someone’s personal space or vice versa… okay it’s hard to write in ‘don’t form. It’s more of a do. This is where our famous ‘Sorry’ comes from. You’re not apologizing, you’re just acknowledging someone else’s existence and voicing consideration in their general direction."
"Or, before you invade someone’s personal space the classic 'just gonna sneak by ya' never fails."
5. "Don't underestimate travel times. Canada is a big country. Also, when asked how far away something is, we tend to answer in time units. It's "a ten hour drive" or "a two hour ferry ride" or "a five hour flight."
7. "It's considered rude if you don't respond to 'thank you' with 'no problem!' or 'you're welcome'. Likewise for holding the door open if you see somebody or saying 'have a good night' when leaving the lift."
8. "If you're driving and someone slows down to let you into traffic, give them a little wave. It might not be as common in big cities, but it is most definitely a thing is most areas."
9. "It's common that if you catch someone's eye while passing in the street you give a little yes nod or a smile. It's not strictly necessary etiquette but don't be surprised if someone does that to you."
"Or here in Newfoundland where you'll also get a 'how ya gettin on der buddy' to which you reply 'best kind'."
10. "Please DO NOT feed the wildlife. The number of times I’ve seen tourists feeding bears along the side of the road is staggering. That puts everyone at risk all because people want to stage a fun photo."
11. "Do not expect public transit to be on time or actually go everywhere you want to go. Do not expect to be able to safely ride your bike everywhere you want. Bike lanes are too few and cars will use them."
12. "When dressing to go out, don't just look at the temperature. -20 can be cold, really cold, or dangerously cold depending on wind and humidity."
13. "Don’t equate French Canadian culture with French Culture. The sayings, expressions and swear words have evolved separately over centuries, just like new world English speakers."
14. "Don't be surprised by Canadian humour: we use a lot of sarcasm and irony. We have our own special way of making a mockery of everything and everyone. We get along pretty well with the Brits on that."
15. "Do not litter. Carry your trash with you until you find a garbage can. This means if you are in a park or wild area with NO services: you pack out your garbage!"
18. "Don’t drink in public places. We have pretty strict laws on where alcohol can be consumed."
19. "It's good to note that the cold tap water might be cold enough to hurt you and the hot tap water might be hot enough to hurt you."
You can read the full thread of responses on Reddit.
Note: Some responses have been edited for length and/or clarity.