Tiered link building is all about creating a smart hierarchy to boost your...

https://web-wiki.win/index.php/The_Art_of_the_Non-Desperate_Guest_Post_Pitch:_A_Strategic_Guide_to_Outreach

Tiered link building is all about creating a smart hierarchy to boost your domain authority. You focus on building high-quality Tier 1 links directly to your site and then use Tier 2 links to power up those pages