Playbooks for portfolio operators — what actually moves domain authority.
If you operate 25+ domains, the bottleneck is not data — it is attention. A monitoring layer beats a research tool you have to remember to open.
Ten thousand backlinks from one domain is one vote. Ten links from ten domains is ten. Why referring domains is the number worth alerting on.
A 0–100 authority number is a compression of a link graph — useful as a trend, misleading as an absolute. Here is how to read it honestly.