The article discusses the challenges developers face when testing WordPress themes and plugins across multiple environments with varying PHP, WordPress, and Gutenberg versions, as well as configurations like HTTPS and multisite. It introduces DevKinsta, a free tool that simplifies spinning up multiple local WordPress sites with customizable settings using Docker, enabling developers to quickly create diverse testing environments without deep sysadmin knowledge. DevKinsta also integrates useful features like WP-CLI, Adminer for database management, and Mailhog for email testing, streamlining local WordPress development workflows.
https://www.smashingmagazine.com/2021/06/multiple-wordpress-sites-locally-devkinsta