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

https://bravo-wiki.win/index.php/What%E2%80%99s_a_Realistic_Tiered_Link_Building_Plan_for_a_New_Site%3F

Tiered link building uses two levels of links to boost your site’s rankings. Tier 1 links point directly to your main pages, driving real traffic and authority. Tier 2 links support those Tier 1 links, making them stronger and more effective