The robot meta tag is about the interaction rules between the website and the search engine.
Site owners can outline a set of rules for crawling and indexing their pages here. Some of these rules are mandatory, while others are more like recommendations-not all crawlers will obey the robot's meta tag, but mainstream search engines will usually obey. If there is no meta robots tag, the crawler will act according to its own wishes.
From an SEO point of view, although these tags are not directly related to rankings, in some cases, they may have some impact on the overall appearance of your website on search engines.
For example, Google highly dislikes thin content.
You may not generate it deliberately, but it happens that there are pages that are of little value to users, but for some reason they are necessary to be displayed on the website.
You may also need to publish "draft" or placeholder pages, which are not yet completed or in optimal condition.
You may not want to consider these pages when evaluating the overall quality of your website.
In some other cases, you may want certain pages not to contain SERPs because they have certain special transactions that should only be accessed via direct links (for example, from newsletters).
Finally, if you have a site-wide search option, Google recommends turning off the custom results page, allowing it to be crawled indefinitely, and wasting robot resources where there is no unique content.
In the above cases, noindex and nofollow tags are helpful because they give you a certain degree of control over the site, as seen by search engines.
Precautions:
Close unnecessary/unfinished pages that are scarce, of low value, and unintentionally appear in the SERP.
Close pages that unreasonably waste crawl budget.
Be careful not to limit important pages to the index by mistake.
The Meta robots tag should be placed at the beginning of the page code, and it should specify the search engine it handles and the instructions that should be applied:
Addressing robots by name - If your instructions apply to all searchers, please use robots, but use specific names to address each searcher. For example, Google’s standard web crawling tool is called Googlebot. Solving a single bot is usually to prohibit malicious crawlers from proceeding on the page while allowing well-intentioned crawlers to continue.
Match instructions to your goals - Generally, you want to use robots meta tags to keep search engines from indexing documents, internal search results, duplicate pages, staging areas, and other content that you don't want to be displayed in the search.
HTML code
The following are some of the most commonly used parameters of robot meta tags. You can use any number of tags in a single meta robots tag, separated by commas:
noindex-page should not be indexed
nofollow-links on the page should not be followed
follow—even if the page is not indexed, the link on the page should be followed
noimageindex-images on the page should not be indexed
noarchive-search results should not show the cached version of the page
unavailable_after—The page should not be indexed after a certain date.
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