If you're self-publishing or thinking about it...

[xenith]

Go and read this article. If any of that is new to you or you feel a need to go check your work for such "mistakes", then do everyone a favour, stop with the publishing stuff and learn to write. That is basic writing craft. Beginner stuff. You should be able to write 200 words on the strengths and weakness of each point before you even start to think about publishing (or submitting) your writing.

Seriously.