The opening is important because it sets the tone of the whole narrative.
Explanation:
The opening of a show, movie or a book or even an article is important because it has mainly two very important things to do:
1. Draw attention of the audience to the work.
This is important so that the people give attention to the work as it unfolds in front of them and do not get distracted from it.
2. Give an idea of what the work is going to be about.
It is very important because in good works of art an opening
- either sets an important plot point
- conveys the tone of the work as it would be throughout.
- builds a mystery
- gives a peak into the world one is going to explore.
Diction
I think diction has to do the most with the subject of word choice
