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

https://papa-wiki.win/index.php/What%E2%80%99s_a_Good_Monthly_Routine_for_Backlink_Audits_and_Cleanup%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 those Tier 1 pages, helping them rank higher