while searching dorking tutorial for beginners i discovered this one pdf among several hundred which as robust information. Let’s share then 
Hope it helps everyone <3
click the below link:
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file is private by owner so please make it public so that we can download it or share new link. Thanks
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Seeing as how this post was over six months ago and the original poster may or may not update the link, I thought I’d give an update. To search for the Google dork document, use Google dorking. A dorkception, if you will. If you are unsure of how to perform said action,
just type “inurl:ghdb.pdf” (without quotes) into the Google search bar.
I can verify that the first couple of listings are the original document that I personally had from quite some time ago. Also, just a heads up, this document is from 2013, so some of the information may or may not still be applicable, but a lot of it still is and serves as a useful learning tool. Good luck and good learning.
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!