Tiered link building uses a two-step approach to boost your website’s ranking....

https://wakelet.com/wake/gzbNnURt3wxkjVZmBBxos

Tiered link building uses a two-step approach to boost your website’s ranking. You start by building strong, quality links (Tier 1) that point directly to your site. Then, you create a second layer of links (Tier 2) that link to those first links