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

https://jaspersexpertinsight.iamarrows.com/how-do-i-measure-success-from-a-tiered-link-building-campaign

Tiered link building uses two levels of backlinks to boost your site’s ranking. Tier 1 links point directly to your site and carry the most weight. Tier 2 links support those Tier 1 links, helping them appear stronger to search engines