Tiered link building boosts your site’s authority by using two levels of links....

https://www.foxtrot-bookmarks.win/tiered-link-building-is-a-strategy-that-helps-boost-your-site-s-ranking-by

Tiered link building boosts your site’s authority by using two levels of links. Tier 1 links point directly to your site and should be high quality. Tier 2 links support those Tier 1 pages, making them stronger in search rankings