How to Start a Robots.txt file:
To Prevent a Domain for all Search Engine Bot
Here User-agent command is used to show search engine bot name and * is for all the search engine bot present in the whole World. Disallow command is for preventing robots to crawl and index the website and / is for the main domain.
To Prevent a Domain for a Specific Search Engine like Google
Note: In front of user-agent always type the robots name of any search engine. For example: Yahoo robots name is slurk so that type slurk not Yahoo. To know the Bot name of some popular search engine visit https://www.keycdn.com/blog/web-crawlers/
To Prevent any page in Domain
Disallow: /xyz if the page don't have any subpages.
To prevent any page under any category or folder
To Delay Crawling of any search engine
Crawl-delay: 4 (means after four days crawler revisit your website).
Note: Allow command is only applying for Googlebot.
Thus, you can disallow many pages, folders and catageries in your website by using the robots.txt file. Mainly it is used to prevent indexing of that matter which can penalize your website on the search engine.
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