Tiered link building uses two levels of links to boost your site’s SEO. Tier 1...

https://mega-wiki.win/index.php/Is_Domain_Authority_(DA)_Still_a_Good_Metric_for_Link_Building%3F

Tiered link building uses two levels of links to boost your site’s SEO. Tier 1 links point directly to your site, driving real traffic and authority. Tier 2 links support Tier 1 by linking to those pages, strengthening their power