What is redundancy, and why should writers avoid it?
Redundancy is writing more words than what is necessary to get the point across. Sometimes, writers can say the same phrase over and over, and it doesn't add anything to the content of their writing. Taking it out and making the writing more concise increases readability of the writing.
Why is conflict important to a short story?
Without conflict, a writer wouldn't build the reader's interest, and therefore, nobody would care. Conflict draw the line between protagonist and antagonist and helps the reader discover which is which.
What is the difference between a concrete noun and an abstract noun?
Think about the terms abstract and concrete as if you were trying to explain them to me. Something abstract isn't easily seen or touched, but something concrete is. The same principle applies to abstract and concrete nouns... The way I look at it is you can slap concrete, but you can't slap something abstract! :)