Imagine showing your work to the great writers... is it good enough? if not keep working on it - don't say "it'll do".
Every day you MUST open the dictionary - it's like washing your face, and even if you don't read a word, open it still. Words bring with them everywhere they've been - know their history if you can.
Author's judgements on the page make the author present.
A story can't just be about another sad case - make it matter, the reader needs to suffer with the character, need to find something new.
Give essential information as early as possible in a story.
You covet what you see, what's noticed by your character tells a lot about what they want.
Nothing in a short story can come to nothing - everything must have significance.
Imagine you are representing the character in court, you have to represent them fairly and honestly.
Self expression is what happens after 3 double whiskeys, great fiction is full of restraint.
Anyway - those are just a few of the things I thought were worth noting. Hope any of yez that are writers out there get some value from them.