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

https://www.bookmark-jungle.win/tiered-link-building-boosts-your-site-s-authority-by-creating-two-layers-of

Tiered link building uses two levels of backlinks to boost your site’s ranking. Tier 1 links point directly to your site from trustworthy sources. Tier 2 links support those Tier 1 links, making them stronger and safer