Tiered link building is a strategy that helps boost your site’s ranking by...

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

Tiered link building is a strategy that helps boost your site’s ranking by creating two levels of backlinks. Tier 1 links point directly to your site and have the most value. Tier 2 links point to your Tier 1 links to strengthen them