You'll see lots of advice about "SEO" or Search Engine Optimizing, or "using keywords." Much of that advice can actually hurt your Google rankings, especially "keyword stuffing," or deliberately over-using the terms you think will bring your page to the top ranks in a search. Google and other search engines are constantly changing the way they calculate search rankings, and they're getting smarter about figuring out ways of rewarding quality sites. That means that the best way of making sure your pages and posts have top search engine rankings and appear in the first few results when someone does a search is to write well.
Really. Good writing trumps all the deliberate use of SEO keyword techniques.
But what, you ask, is good writing? I'm glad you asked, Grasshopper.
To begin with, good writing means being as clear as you can about what exactly you're writing about.