Tiered link building passes authority from support pages to your main site....

https://www.alphabookmarks.win/tiered-link-building-helps-you-scale-authority-safely-by-pointing-quality-tier

Tiered link building passes authority from support pages to your main site. Learn to build Tier 1 links to your domain and use Tier 2 links to boost those pages. With Ahrefs, you can track this structure effectively