Why do I need to evaluate?
Whether you search the web or the databases, be critical and discerning in your searches and in your use of whatever you might find. Think about:
Purpose/Point of View
Advanced Web Searching
Most search engines offer "advanced" search features. (Google's link for "advanced" is just to the right of the main search box on the Google homepage.) Advanced features let you control your results with domain (site "type") limiters, language preferences, and other options.
If you're going to use the open Web, use it wisely. Control your results, and don't just settle for what's at the top of the list.