Consultants see more geolocation files than anyone, from more sources, in more states of disrepair. What you need is speed, a defensible answer, and not having to explain to a client why their suppliers' data went through a third-party server.

Checking a client file (free)

Training material

The guides and the glossary are written for people who are not GIS specialists, with every regulatory statement sourced. Link to them freely.

With the Consultant plan

See pricing.