Hello Friends!!!
How to disallow a particular directory from being crawled by google? [Important| Updated May 2019]
Use this simple code to disallow a particular directory from being crawled by Google [Latest 2019]
- Login to your cPanel
- Go inside File Manager
- Click on public_html
- Create a robots.txt file
Use this code:
User-agent: Googlebot
Disallow: /protected-directory/
This code will disallow the protected directory from being crawled by Google.
Just for an example i have searched https://facebook.com/robots.txt and found all the directories which has been disallowed to be crawled by Google.

Hope this helps you!!!
Thanks for reading!!!