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

https://post-wiki.win/index.php/What%E2%80%99s_the_Best_Way_to_Track_New_Backlinks_After_Outreach%3F_22351

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