This article explains how tiered link building works by using two levels of...

https://weekly-wiki.win/index.php/What%E2%80%99s_the_Safest_Way_to_Build_Links_Over_Time_Without_a_Penalty%3F

This article explains how tiered link building works by using two levels of links. Tier 1 links point directly to your site, providing strong, quality backlinks