Robots.txt is a small text file which needs to create in the root directory of your website.
On cPanel server, you will need to put robots.txt fiile into /public_html/ folder.
It tells well-behaved crawlers whether to crawl certain parts of the site or not. The file uses a simple syntax to be easy for crawlers to put in place.
In order to block all bots from accessing your site, you need to create a robots.txt file with the following content:
To block all bots from accessing a specific folder, you should create a robots.txt file with the following content:
You can create/modify the robots.txt file via File Manager in cPanel.