Google has become the default search tool for so many people. Consequently, there are numerous print and online guides to using it. The following are just a few, selected examples. Find what works for you.

For info on Google

Google Inconsistencies

Books on Google

Newer is better, as Google Labs keeps developing new tools and evolving the search engine itself. So, while there are other good books on Google, I would, generally, look for the most recent ones. Still, the general rule is find something that works for you.