A Strapi project can be created using the command `npx create-strapi-app my-project --quickstart`, and internationalization is automatically enabled in Strapi applications running version 3.6.0 or later. The process of setting up i18n features involves installing the internationalization plugin, creating a new locale, enabling localization for the collection type, and creating content in multiple locales. In a Next.js project, the next-i18next library is used to implement internationalization, which requires setting up a configuration file, importing translations, and using server-side translations to pass data to pages. The Strapi backend is then used to retrieve localized content, and the Next.js frontend displays the content in the correct locale.