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

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

Tiered link building uses two levels of backlinks to boost your site’s authority. Tier 1 links point directly to your site and have the most impact. Tier 2 links support those Tier 1 links, making them stronger and safer