This lesson has one big idea

This lesson is all about contrast (and its avatar, juxtaposition).

Contrast is arguably the most important concept in narrative—possibly in writing in general, maybe even in life.

Wall crumbles while fireman tries to extinguish fire

And here's an example of contrast in narrative writing:

"Proud and insolent youth," said Hook, "prepare to meet thy doom."

"Dark and sinister man," Peter answered, "have at thee."

Peter Pan(1911)

This lesson has one simple thesis:

If you focus on contrast when writing a story, everything else will take care of itself.

That's not completely true—otherwise, this would be the only lesson you'd ever need.

But if you had to choose one thing to focus on, then contrast is a good starting point because is underpins everything else.