Essentials for crossing the US-Canada border

Hi this is my first post here so if this isn't the correct type of post or flair my bad. I'll be going to Toronto in a few months just for a concert so I'll likely only be there for the day. I've googled any documents and stuff I'll need to cross so I think I've got the basic gist but I'd also like any personal accounts just in case I bring more than I need or not enough, so has anyone been to Canada by car from the US in the last few months? I'm driving from buffalo if that helps at all.