Building multilingual websites with Gatsby involves addressing challenges such as language fallbacks, ISO codes, and language-sensitive content management, which are crucial before implementation begins. The process requires considerations like localizing URLs, identifying user locales, and generating both dynamic and static language-specific pages, along with updating components to manage language selection and propagation. Using Gatsby plugins, such as gatsby-plugin-i18n, facilitates handling multilingual support by automating locale identification and page generation. Successful implementation hinges on gathering thorough requirements upfront to define the website's behavior and content restrictions, ensuring a seamless multilingual experience. The article illustrates these concepts through an example involving a Gatsby and Kentico Kontent project, emphasizing the importance of plugins and thoughtful configuration for effective multilingual site development.