Tiered link building helps you boost your website’s authority by building links...

https://www.yankee-bookmarkings.win/tiered-link-building-uses-two-levels-of-links-to-boost-your-site-s-seo-tier-1

Tiered link building helps you boost your website’s authority by building links in layers. Tier 1 links point directly to your site and carry the most value. Tier 2 links support those Tier 1 links, making them stronger and more effective