Tiered link building helps boost your site’s authority by creating two levels...

https://wiki-coast.win/index.php/How_Do_I_Diversify_My_Link_Sources_Without_Making_a_Mess%3F

Tiered link building helps boost your site’s authority by creating two levels of backlinks. Tier 1 links point directly to your website from quality sources, while Tier 2 links support those Tier 1 links, making them stronger