Worked on the googleapis/google-auth-library-nodejs repository to enhance developer experience and security by updating documentation related to Application Default Credentials (ADC) setup. Focused on technical writing and documentation using Markdown and YAML, the work involved revising the README to align with current best practices and removing outdated instructions for downloading service account key files. This approach guided users toward environment-appropriate ADC workflows, reducing risk by discouraging direct management of service account keys. The changes improved onboarding clarity for developers and ensured documentation accurately reflected newer ADC flows, supporting both security and usability for teams integrating with Google authentication libraries.