This approach focuses on powering up key links by building a structured chain of backlinks.
Rather than pointing low-quality links straight at your main website, tiered strategies build links to your supporting content at the top layer, which in turn pushes link juice to your primary target.
This is a smart way to reduce risk while still gaining SEO traction.
If you're interested in this method, check out this Tier Multi-layer SEO strategies 1 post