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

https://www.slideserve.com/richard_russell21/what-should-i-use-for-tier-1-links-if-i-want-to-rank-a-landing-page

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