Tiered link building uses two levels of links to boost your website’s ranking....

https://www.bright-bookmarks.win/this-article-explains-tiered-link-building-in-simple-terms-it-breaks-down-how

Tiered link building uses two levels of links to boost your website’s ranking. Tier 1 links point directly to your site and carry the most weight. Tier 2 links support those Tier 1 pages, making them stronger and more trustworthy