The document discusses how to build a lean SaaS application using WordPress Multisite. WordPress Multisite allows for easy, scalable, and customizable development of SaaS apps. It provides features like a built-in user system, plugins, and separate environments for each customer site. An example SaaS app called Diet Club is presented, which was built with WordPress Multisite to provide meal plans and recipes on a structured, per-customer basis using custom post types and taxonomies. WooCommerce and membership plugins allow turning the application into a paid SaaS.
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