Worked on the renuo/applications-setup-guide repository to enhance project documentation, focusing on improving the Rails setup guide and Sentry configuration instructions. Used Markdown and documentation management skills to remove outdated React Native and frontend tooling sections, consolidating content for better maintainability and clarity. Updated the Sentry configuration documentation to clarify environment variable usage, reinforce a single DSN across environments, and introduce the SENTRY_ENVIRONMENT variable for more accurate error tracking and grouping. The work addressed duplication and outdated information, resulting in a more streamlined onboarding process and clearer guidance for developers configuring error monitoring in Rails projects. No bugs were reported.