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

https://www.mediafire.com/file/z9mgvqdwwo1eb8a/pdf-42897-77316.pdf/file

Tiered link building uses two levels of links to boost your website’s rankings. Tier 1 links point directly to your site and should be high quality. Tier 2 links support those Tier 1 links, helping them rank better in search results