This article breaks down tiered link building by explaining how Tier 1 links go...

https://www.bookmark-suggest.win/our-dedicated-outreach-efforts-within-our-advanced-link-building-framework-ensure-you-secure-high-quality-backlinks-from

This article breaks down tiered link building by explaining how Tier 1 links go directly to your site, while Tier 2 links support those Tier 1 pages