This article explains tiered link building, where Tier 1 links point directly...

https://station-wiki.win/index.php/How_Do_I_Build_Tier_2_Content_That_Looks_Natural_and_Not_Forced%3F

This article explains tiered link building, where Tier 1 links point directly to your site for strong SEO impact. Tier 2 links support those Tier 1 links, boosting their power and helping your rankings grow steadily