The easiest way to build an online WordPress directory website is to install Web 2.0 Directory plugin. As well it is really easy to convert any existing site into a fully featured directory business website with the directory plugin. Wordpress directory plugin for any purposes, and examples would be classifieds, events directory, cars, bikes, boats and other vehicles dealers site, restaurants, pets, real estate portal, wedding site, yellow pages, local directories, map store locator.
Demo: https://codecanyon.net/item/web-20-directory-plugin-for-wordpress/6463373
Demo: https://codecanyon.net/item/web-20-directory-plugin-for-wordpress/6463373