Yerim Park contributed to the 42srr/STUDY_CS repository by updating documentation for a networking course, focusing on Chapters 3 and 4. She enhanced materials covering network layer concepts, forwarding and routing, SDN control planes, router internals, and TCP fundamentals such as connection establishment, segment structure, reliability, flow control, and congestion control. Using Markdown and applying her technical writing and networking knowledge, Yerim ensured the documentation was clear, traceable, and aligned with current networking standards. Her work provided students with up-to-date, accessible resources, demonstrating depth in both technical content and communication, though her contributions were limited to documentation updates.