Tiered link building helps boost your website’s authority by creating two...

https://wiki-planet.win/index.php/Should_I_Use_Forums_for_Tier_2_Links_or_Skip_Them%3F

Tiered link building helps boost your website’s authority by creating two levels of backlinks. Tier 1 links point directly to your site and are high quality. Tier 2 links support your Tier 1 links, making them stronger and more effective