Worked on the toss/frontend-fundamentals repository to enhance documentation usability by addressing a navigation issue in the Japanese sidebar. Focused on frontend development and documentation, the developer identified and fixed a broken link directing users to the Japanese community section, ensuring seamless access for Japanese-speaking users. The solution involved updating the sidebar configuration using JavaScript, with careful attention to localization standards and documentation quality. This targeted bug fix improved onboarding and reduced potential support requests by making community resources more accessible. All changes were tracked with precise commits and issue references, reflecting a methodical approach to maintaining documentation reliability and accessibility.