How to identify errors
Check your writing
Once your story is finished, read it to yourself.
Pretend that someone else wrote the story, see how well you think the story is written and then rewrite it to make it better.
Make sure your sentences flow nicely and double-check your facts.
Check everything makes sense and look out for spelling, grammar and punctuation mistakes.
Most authors, even famous ones, rewrite their stories many times before they are happy to let someone else read them.