They say the devil is in the details. When it comes to search engine optimization, those details include some important quirks you need to know about.

• Conforming to search engine behavior

• Keeping-up with changes in search engine behavior

• Playing well with other websites to protect your SEO

• Avoiding common practices that obstruct SEO

Here are nine examples of what I [Tom Schmitz of Search Engine Land] call SEO quirks. See how many you know about.