Worked on the ebookfoundation/free-programming-books repository, focusing on improving documentation quality and consistency. Addressed a recurring typographical error by systematically correcting instances of "Operation System" to "Operating System" across educational resources, ensuring greater accuracy and clarity for users. Utilized Markdown for content editing and documentation updates, delivering a single, well-documented commit that maintained repository standards and traceability. The approach emphasized careful review to prevent regressions and preserve the integrity of existing materials. This targeted fix enhanced the user learning experience by supporting better onboarding and searchability, ultimately contributing to improved trust in the repository’s educational content and documentation.