Tiered link building uses two levels to boost your website’s authority. Tier 1...

https://blogfreely.net/paige-coleman3/guest-posting-for-tier-1-links-what-should-i-watch-out-for

Tiered link building uses two levels to boost your website’s authority. Tier 1 links point directly to your site and have the highest quality. Tier 2 links support Tier 1 by linking to those pages