Recently I learned an essential guideline for good writing. Granted, I'm not as experienced with writing but I found this to be very useful and wanted to share.
When writing it is better to Show It Not Tell it. Give Information through action and dialog versus narration.
I was known for not following this which I believe made my writing stale. But, now that I've started following this guide I find my writing easier, more fluid and better to read. My latest upcoming story will reflect this, of course it's not complete yet.