This seems like a guideline for all stories.

*Proof read. Sometimes, authors post their works without proof-reading. And then there are all kinds of errors. I don't thrive on errors. They ruin a story for me and turn me away. And I'm sure I've moved away from a good story or two because of it.

My personal preference: I write a book, get the draft done, then go back through it and do a chapter outline, highlighting events and special things that I want to make note of. I get a better knowledge of my story and learn it practically inside out. 

*Use proper language. What do I mean by this? No text talk in your writing. 

Unless it's necessary for the story, like, characters are exchanging messages. That's the only acceptable time. 

*Edit. Correct errors. Read sentences out loud if you must! If you don't feel confident in your editing abilities, ask someone. There's always a helpful person out there who would love to help make your book better.

*Stay within your story's tense. Meaning if it's written in past tense, keep it there. Don't switch from past to future, or past to present. It confuses the reader and yourself if you don't catch it right away. 

*Don't change POVs. Basically, if the story is third person, please keep it that way. If it's first person, unless there's a good reason for a POV switch, please keep it in first person. To me, it's all right if it's a full chapter of a different POV and then the next it gets switched back to its original POV. But, for the love of anything, don't halfway switch from first to third POV in the middle of a chapter. It's disorienting.

*Give your story a kick-ass title. Don't make it similar to others, that's how your story gets lost and never gets discovered. Think it through. Would the title symbolize a big theme in the story? Does it summarize what's going to happen? A clever title helps.

P.S. Don't make it incredibly long, either. A title is a title, not a run-on sentence. 

*Use author's notes wisely. This is a personal pet peeve of mine: Author's notes should be their own things, meaning their own part. If they're not, they should either be placed in the beginning of the chapter, before the readers actually get to the content, or at the end of the chapter, after the content. 

I despise author's notes in the bloody middle of the story. It interrupts the flow. Like, no, I was reading. Why did you interrupt me? Nobody comes between me and my reading.

*blushes* Oops.

*Enhance the reader's experience. Multimedia on here, I think, helps. Find a gif or a picture to go along with the chapter. Find a song that sums up the chapter or sets a certain mood. Interact with readers in the author's notes. Take polls. Encourage them to provide feedback! Make the experience enjoyable!

Thinker: Biggest challenges in this department? Easiest? How critical is organization and mechanics to you as an author?