Tiered link building uses two levels of links to boost your site's authority....

https://www.bookmarking-presto.win/tiered-link-building-builds-site-authority-i-connect-high-quality-tier-1-links

Tiered link building uses two levels of links to boost your site's authority. Tier 1 links point directly to your main pages and have the most value. Tier 2 links support Tier 1 by linking to those pages, increasing their strength