Books are written because an author wants to write and a reader wants to read. Fiction is a most read form of writing and it is the kind of writing that is not factual.
In the world of fiction, I am going to concentrate on four aspects of fiction: Flash Fiction, Short Story, Novella, and Micro Fiction.
Flash Fiction is small. They are short, short stories. Generally consists of 500 to 750 words. Well, if you think writing that many words is easy for you, think again. If you still think it is easy for you, well try to the limit. In my research a Flash Fiction does not exceed 1,000 words.
Short Story which is something between a Flash Fiction and a Novella. I love reading short stories. They give me enough to really satisfy my curiosity about the character and plot, bringing the story to a dynamic conclusion—all without leaving my chair once. That’s the hallmark of a short story. You should be able to read it in one sitting.
Normally, a short story range from 1,000 to 10,000 words but the genre also has a big part in it.
Novella. Five years back if you would ask me what a Novella is, I might have not known. And I have never written one. The length gives you room for more characters and more story. It pulls up short of a novel, making it the perfect size for avid readers with a short attention span.
Some writers want to call their 50,000 or 60,000 word manuscripts a novel. The culprit of this is probably National Novel Writing Month. It challenges you to write a novel in a month. The goal is 50,000 words. But if you ask a publishing company they would underline the words that minimum is usually 80,000 words and can go as high as 240,000. But then we have the genre thing again.
Micro Fiction. It is tiny. Generally about the length of a Tweet or maybe a little longer than that.
Hopefully, my explanation of the specific terms was informative.