Tiered link building uses two levels of links to boost your website’s SEO. Tier...

https://seo.edu.rs/blog/how-do-i-build-tier-2-content-that-looks-natural-and-not-forced-11162

Tiered link building uses two levels of links to boost your website’s SEO. Tier 1 links point directly to your site, giving it real authority. Tier 2 links support those Tier 1 links, making them stronger and more effective