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

https://telegra.ph/What-Should-I-Use-for-Tier-1-Links-if-I-Want-to-Rank-a-Landing-Page-07-31

Tiered link building uses two levels of backlinks to boost your site’s rankings. Tier 1 links point directly to your site and are high quality. Tier 2 links support your Tier 1 links, making them stronger and more effective