I used to think that all the world's problems would be solved if people would just follow one rule. I've had to revise that a bit. Two rules. If everyone followed these two rules, everything would work out just fine.
1. Don't be an asshole. 2. Don't be an idiot.
With the following corollaries:
1. Tell the truth. 2. Keep your word. 3. Take responsibility for your actions.
Add in a fair amount of "learn from your mistakes" and I think pretty much everything is covered.