I've never understood scene structure.
CONSCIOUSLY. My guess from the rest of your post is that you have a good intuitive understanding.
Scenes ... should ... be entertaining at some level, but don't necessarily have to include a gunfight or a big argument....
Right. The main requirement for scenes, above all else, is that they be engaging in some way. This can be in small ways as well as large, as you pointed out.
Putting a microscope on scenes, we see they are made up of events.
The doorbell chimed.
Sarah walked to the door.
She opened the door.
A police officer stood there.
Each of those events can be entertaining, or at least informative. Or not.
- If an event has no entertainment or informational value we can likely leave it out entirely.
- If an event has only small value we can summarize it, TELL it.
- If an event has a large value we likely must dwell upon it in some detail, SHOW it.
So in the example the first and last events are at least a tiny bit important. If either of the middle two events are not important or interesting we can leave it out.
The doorbell chimed while Sarah was in the kitchen. When she opened her door a police woman was standing on her front stoop.
The walk to the door was left out because it was not important enough to mention it. Our readers will fill in the blank event.
In another scene the walk might be very important to the story, if (say) Sarah was having difficulty walking. This might be from a handicap, or because she was injured or ill. The trip to the door might thus be a heroic event, worth recounting in detail every single step.
In yet a third scene the last event might be very important.
The doorbell chimed while Sarah was in the kitchen. When she opened her door a police woman was on her front stoop, leaning against the door frame, her head down and blood bright on her jacket and on the concrete where it had dripped.