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

https://andressmasterdigests.image-perth.org/how-do-i-build-relationships-before-i-ask-for-a-backlink

Tiered link building uses two levels of backlinks to boost your site’s search rankings. Tier 1 links point directly to your website and have the most value. Tier 2 links support your Tier 1 links, making them stronger