solved I’m working on a humanities discussion question and need support

I’m working on a humanities discussion question and need support to help me learn.

What is genre and why do we care? Often we talk about poetry, plays, and prose as the major genres of writing. Within each of these large category genres, we catagorize into smaller genres: verse poetry or free poetry; romance novels or detective fiction. Genre helps us organize our expectations and as such is very useful in the study of literature. In this course we are of course focusing on the genre of detective fiction.
We have spent the past few weeks reading the earliest authors, learning the methods of detecting from the foundational Detective fathers, exploring the components of their characters. We have also begun to explore how Setting and Tone can influence a story, as well as how the background of Culture can have a huge impact on our understanding and appreciation of a text.
Let’s focus now on Genre. In the early 20th century, the genre of detective fiction will develop, expand, and split into various sub-genres. Authors and their readers develop a keen sense of how a detective fiction should be written, what its structure should be and how the plot should unfold. By 1928 certain “rules” are established. Many of these rules are written in reaction to badly written stories of the early years, but most of them are essential to the game of the primary kind of detective fiction: the Whodunit. 
Read Van Dine’s 20 Rules of Detective Fiction and post your reaction to the Discussion question on the board. 
Van Dine’s rules were written very early in the game. A lot of time has passed since 1928. The genre has developed and split. In this second half of the course we will explore the sub-genres that have developed from the Whodunit, including the American Hardboiled detective tale, the police procedural, the legal drama, and the suspense novel. We will not have time to explore the spy thriller. Sometimes there are not firm divisions between these sub-genres, and a legal drama may also be a suspense novel, etc.
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Now that you’ve read Van Dine’s list of rules, what are for you the most important rules for an author to follow? Quote one or two of them, and comment on their importance to the genre and the “sport” of detective fiction. Have you encountered the breaking of any of these rules yet in Detective fiction or film? Describe that rule-breaking and how it made you feel. Or, perhaps there is another rule that Van Dine neglects to mention?