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

https://www.generate-bookmark.win/tiered-link-building-is-about-precision-i-ll-show-you-how-to-leverage

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