In 1988 Stephen King published the article Everything You Need to Know About Writing Successfully - in Ten Minutes,
to read the while thing follow this link.

My comments of the main points:

1. Be talented: King claims that if you can write for money you got talent, I agree.
2. Be neat:
3. Be self-critical: I agree, only God is perfect.
4. Remove every extraneous word: I wish bloggers would do this. A lot of the blogs I read frequently had posts that are very wordy. No need to spend 2500 word expressing an idea that could be described in 300 words.
5. Never look at a reference book while doing a first draft: It makes sense, it is best to say what you have to say and then edit it?
6. Know the markets: If you are writing for an audience then this is vital.
7. Write to entertain:“your serious ideas must always serve your story, not the other way around”
8. Ask yourself frequently, “Am I having fun?”
9. How to evaluate criticism:
   • “if a lot of people are telling you something is wrong with you piece, it is”
   • if everyone is criticizing something different, you can safely disregard what all of them say
10. Observe all rules for proper submission
11. An agent? Forget it.
12. If it’s bad, kill it

Other who has blogged about this:

• Jimeno Arroyo
  Actually some very good comments here, better read this first
• Becky Mushko
  This blogpost also got links to writing advice from John Scalzi:
  • Utterly Useless Writing Advice
  • Even More Long-Winded (But Practical) Writing Advice
  • 10 Things Teenage Writers Should Know About Writing