Tiered link building uses two levels of links to boost your website’s...

https://www.social-bookmarkings.win/tiered-link-building-is-an-effective-way-to-scale-your-seo-without-burning-out

Tiered link building uses two levels of links to boost your website’s authority. Tier 1 links point directly to your site and carry the most value. Tier 2 links support those Tier 1 pages, making them stronger and more credible