Tiered link building boosts your site's authority by creating two levels of...

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

Tiered link building boosts your site's authority by creating two levels of backlinks. Tier 1 links point directly to your site and come from high-quality sources. Tier 2 links support those Tier 1 links, strengthening their value