FamilySearch features a helpful video where Fritz Juengling explains how to use the website WieWasWie (Who Was Who) for researching your ancestors in the Netherlands.
About Yvette HoitinkYvette Hoitink, CG®, QG™ is a professional genealogist in the Netherlands. She holds the Certified Genealogist credential from the Board for Certification of Genealogists and has a post-graduate diploma in Family and Local History from the University of Dundee. She has been doing genealogy for over 30 years and helps people from across the world find their ancestors in the Netherlands. Read about Yvette's professional genealogy services.
Thank you.
I have used this before but this makes it clearer.