Hackers can exploit the types of technologies your company uses, hackers can exploit that information. Figure out what common error messages are generated by the Web servers and application servers. Use the “**” string to search for any data that fits this format that has been posted on your own website or maliciously elsewhere on the Web. Another way to look for passwords is by searching your site for the text “index of password” This searches for a directory named “password,” which may contain some interesting files.”]
Source: https://www.csoonline.com/article/2120748/4-google-searches-to-run-on-your-own-company.html