This article breaks down tiered link building, explaining how Tier 1 links...

https://wiki-club.win/index.php/What_Should_I_Say_in_a_Broken_Link_Outreach_Email_to_Get_a_Yes%3F

This article breaks down tiered link building, explaining how Tier 1 links point directly to your site to boost its authority. Tier 2 links then support those Tier 1 links, helping them rank higher