Erika developed a Number Theory Study Directory within the UngSangYoon/Algorithm_Study_FISA repository, focusing on creating a maintainable structure for algorithm study resources. She organized the directory with a detailed README.md, including study information and a link to her profile, and added a Python script to validate the new structure. Her approach emphasized clear repository organization and disciplined Git workflows, using Markdown for documentation and Python for scripting. While the work was limited in scope, it addressed onboarding and resource discoverability, laying a foundation for future study materials. No bugs were fixed during this period, reflecting a focus on new feature delivery.