Who this is for
The questions differ by what you run. Pick the closest one.
For SaaS products
Most of your product lives behind a login, where a page URL says nothing useful. Measure the actions instead.
For online stores
A missing third of your traffic is a missing third of your attribution. Start by measuring everyone.
For agencies
Reporting is the part of the work clients see. Make it fast, branded, and impossible to argue with.
For publishers and media
High volume, an ad-blocking audience, and readers who will notice what you load. All three matter here.