Mohammed Safarookhi contributed to the ebookfoundation/free-programming-books repository by adding the Rego Playground to the Playgrounds list, expanding hands-on learning resources for Rego programming. He approached the task with careful content management and clear documentation, ensuring the new resource was integrated without disrupting existing catalog structure. Using Markdown and Git, Mohammed maintained traceability by linking his changes directly to the relevant issue and pull request, streamlining the review process. His work focused on enhancing the resource catalog for learners while keeping changes isolated and release-ready. The contribution demonstrated attention to open-source collaboration and effective change management within documentation workflows.