Mintlify is a platform that transforms MDX files into beautiful documentation, including autogenerating API playgrounds, request and response samples, and more from OpenAPI specs. To get started, you need to generate your OpenAPI spec, create a Mintlify docs deployment, configure your OpenAPI in the docs, autogenerate your endpoints, and showcase your API. The process involves several steps, including installing the GitHub app, adding the OpenAPI spec to the root folder, configuring the API playground, and organizing the API endpoints in the sidebar. With Mintlify, you can create beautiful and SEO-optimized API documentation quickly and easily.