During a one-month period, contributed to the se-sac/sesac-01 repository by delivering a foundational documentation feature focused on onboarding and data accuracy. Developed and initialized README.md files for both class01 and class02 homework within the KimSeongHyun directory, using Markdown to ensure clarity and maintainability. The work included updating student information to correct entry '02' in both files, directly addressing data integrity and readiness for new users. Emphasized precise documentation practices to stabilize class records, supporting future scalability. The approach centered on clear, structured documentation and careful data correction, with all changes tracked through version control to maintain repository consistency.