Tiered link building boosts your site’s authority by using two levels of links....

https://wakelet.com/wake/gzbNnURt3wxkjVZmBBxos

Tiered link building boosts your site’s authority by using two levels of links. Tier 1 links point directly to your site and should be high quality. Tier 2 links support those Tier 1 pages, making them stronger in search rankings