Jongwoo Choi enhanced the restful3/ds4th_study repository by updating study materials and improving documentation to streamline onboarding and resource navigation. He finalized presenter information in the README, added a direct link to Chapter 2, and included a new PDF resource to increase accessibility for participants. Working exclusively with Markdown, Jongwoo focused on clear, maintainable documentation practices, ensuring that all updates were isolated to non-code resources and did not introduce instability. Over the course of the month, he delivered two new features centered on documentation and resource management, maintaining repository quality without the need for bug fixes or codebase changes.