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

https://mega-wiki.win/index.php/What_is_HARO_Link_Building_and_Is_It_Still_Worth_It%3F

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