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

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

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