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

https://ace-wiki.win/index.php/What_are_the_Most_Common_Tiered_Link_Building_Mistakes_Beginners_Make%3F

Tiered link building uses two levels of backlinks to boost your site’s authority. Tier 1 links point directly to your site and carry the most value. Tier 2 links support your Tier 1 links by linking to them, which helps strengthen their impact