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

https://eduardossmartcolumn.cavandoragh.org/what-s-the-best-way-to-track-new-backlinks-after-outreach

Tiered link building uses two levels of backlinks to boost your site's authority. Tier 1 links point directly to your site and carry the most value. Tier 2 links support those Tier 1 pages, helping increase their strength and improve your rankings