What exactly is going on with the current political situation in Canada?

I’ve been to busy with exams to pay much attention, and now it seems like I’ve been living under a rock. I’ve heard many vague, biased answers about what is going on. What I want are the basics of what is going on.

I am Canadian, and I feel like this has a great impact on my life. I’ve done some research just now, but people are only talking about what’s going on now, not how it started. It’s like walking into a movie halfway through and you’re so confused.