Backlinks are links to your site posted on third-party resources.
Backlinks attract Google search robots to a resource, there are two types of search robots - crawlers and indexers. First come the crawlers and then the indexers, the more backlinks the better, as more search engine crawlers appear on the resource being promoted.
The main purpose of backlinks is not to attract customers from the resources placed, and show the robots of the Google search engine link mass to your site, this makes the site liquid, the more links, the more credibility to the site
Anchor link is a clickable link with a keyword that leads to your site. By using this keyword, you are showing the Google search engine that your site should be shown for this keyword query.
To promote your site with keyword backlinks, don't start with high-frequency keywords because they are very competitive. Start with low-frequency keywords because they are easier to rank for.
I send a progress report through https://majestic.com, https://semrush.com or https://ahrefs.com. I report on a service that has more backlinks because of the indexing delay.
Backlinks for the site, backlinks for SEO
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