Based on my personal experience, the best way to improve my skills is by looking at examples. Specially when it comes to usability guidelines. It's much harder to repeat usability mistakes when I remember a real-world example.
19 Lessons from United Airlines on How To Build A Crappy Survey
While there are more than 19 ways to screw up the usability of a survey, this article is going to help you design a more usable survey. And it's far more entertaining that a list of guidelines...
