This article explains tiered link building, where Tier 1 links point directly...

https://bizzmarkblog.com/what-anchor-text-should-i-use-for-tier-2-links-pointing-to-tier-1/

This article explains tiered link building, where Tier 1 links point directly to your site for strong SEO impact. Tier 2 links support those Tier 1 links, boosting their power and helping your rankings grow steadily