I have never heard of The National Wood Flooring Association. Why does it matter if I hire a professional that has taken their training?

NWFA represents more than 25,000 professionals worldwide, so finding one in your area is easy. NWFA members have access to industry standards, training programs, and skills certifications that validate their professional expertise.

The NWFA also maintains a Certification Program that was developed to recognize and promote the competence of wood flooring professionals throughout the industry. Industry professionals undergo both online and hands-on testing to earn their certifications.
NWFA Certified Professionals set themselves apart from their competition by attending training and earning certifications through the NWFA. Certification validates industry knowledge and expertise and recognizes individuals as experts in their field.

https://industryguide.hardwoodfloorsmag.com/professional-search