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

https://zulu-wiki.win/index.php/Why_Do_Link_Building_Agencies_Cost_More_Than_DIY_in_Practice%3F

Tiered link building helps boost your website’s authority by creating two levels of backlinks. 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