Google can provide plenty of useful information during footprinting process. Google hacking have been around for a long time although it is not widely known to the public. The process is simple but effective. We will use fine-tuned operators to get precise information.
Using Google hacking we can get information on
Lets look at the operators that make this possible. Each operator is entered directly in the google search window.
Displayes the version of a web page that Google contains in the cache and not the current version.
Shows websites with links to the specified site. In our case mysite.com
Shows information about listed page
Restricts searches to location specified. In our case we search mysite.com for myword
Example: myword site:mysite.com
Returns pages with specific keywords in there title
Restricts searches to url with keywords specified
Find sites that are similar to a web address you already know.
Find pages that might use one of several words.
Example: marathon OR race
Here is very good source for reference: https://www.exploit-db.com/google-hacking-database/
Also be careful and don’t do too many queries at ones as google can shut them down.