Tiered link building uses two levels: Tier 1 links point directly to your site,...

https://eduardossmartcolumn.cavandoragh.org/broken-link-building-step-by-step-using-ahrefs

Tiered link building uses two levels: Tier 1 links point directly to your site, boosting authority right away. Tier 2 links support Tier 1 by linking to those pages, making them stronger and more credible