Here is a good article on copywriting with real-world examples. I find examples like this much easier to learn from than just providing a list of advice.
Challenge: Analyze your key landing page for each of the copywriting techniques. You can even go a step further and A/B test to see which changes generate better results.
I have done at least a dozen edits on the IdeaEconomy landing page to try to hone my message and maximize signups. The next version will incorporate a few more of these techniques.