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

https://fun-wiki.win/index.php/My_Outreach_Emails_Get_Ignored_%E2%80%93_What_Am_I_Doing_Wrong%3F

Tiered link building uses two levels of links to boost your site’s authority. Tier 1 links point directly to your website and carry the most value. Tier 2 links support those Tier 1 links, helping them perform better in search rankings