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

https://dibz.me/blog/strategic-insights-crafting-an-effective-tiered-link-building-campaign-959

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