Tier 1 links are your direct authority boosters while Tier 2 links help them...

https://www.bokkmarking-signs.win/stop-wasting-time-on-random-backlinks-build-a-solid-structure-using

Tier 1 links are your direct authority boosters while Tier 2 links help them stay relevant. Using Ahrefs to monitor your backlink profile helps you see how these layers push rankings up without overdoing it