How does website indexing work?

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Speed ​​of getting a site into the index
If we are talking about a commercial website, we need to speed up the indexing process as much as possible and, consequently, the availability of such Internet advertising for users. The time after which the website will start receiving visitors and generating profit directly depends on this, so we need to ensure that a number of actions are carried out as much as possible.

Notification to the search engine about the appearance of a new site. This can be done by publishing links on other resources and necessarily through registration in Yandex.Webmaster. Similarly, to index a site in Google, you should add it to the Search Console service. The URL gets to Yandex.Webmaster through the "Page re-crawl" section. The option of transferring URL pages for indexing is also possible in Yandex.Metrica installed on the site.
Check the site for accessibility and absence of serious taiwan cell phone number list errors in the code on validation services. This is necessary so that the "spider" does not miss the queue for crawling due to the site being unavailable or having a large number of technical errors. If this happens, you will have to wait for the next crawl.
Create two sitemaps. One in the form of a regular page with links to all pages of the resource, the second in the form of a service file Sitemap.xml, which is placed in the root of the site on the hosting. Both maps are made for most modern content management systems automatically by simple settings.
Set up the Robots.txt file according to the recommendations for the selected content management system to prevent identical materials located at different addresses from being indexed. The file also specifies the presence and location of the Sitemap for search robots.
When performing internal SEO optimization of a website, use internal cross-linking, which will allow robots to find the addresses of other pages of the resource.
Ensure systematic addition of information to the site. The system will consider this resource frequently updated and useful for visitors.
You should also take care of the quality of the site content meeting the requirements of the search engine. Otherwise, you may see a situation where the site gets into the search after being crawled by a fast robot, and some time after the main robot has collected information and analyzed it, some pages or even the entire resource falls out of the search results. This happens because the quality of the content does not meet the rules of the search engine, for example, it may not be unique or oversaturated with keywords.