Contributed a Polish-language Arduino course to the ebookfoundation/free-programming-books repository, expanding access to educational resources for Polish-speaking learners interested in Arduino programming. Focused on content creation and educational resource development, the work involved authoring and integrating new material using Markdown while ensuring alignment with repository contribution standards. The addition improved content localization and broadened the reach of open-source programming education. Throughout the process, maintained clear documentation and commit practices, collaborating via Git to ensure seamless integration. No bug fixes were required during this period, as the primary emphasis was on feature delivery and maintaining the quality and consistency of the repository.