Worked on the cloudwego/eino-examples repository to enhance the Quickstart documentation for developers implementing custom callback handlers in the Eino framework. Focused on updating the guide to use the current NewHandlerBuilder API instead of the deprecated NewHandlerHelper, ensuring alignment with recent changes and improving clarity for Go developers. Addressed a documentation error identified in commit #208 and updated the relevant example in Chapter 6 to reflect these improvements. Collaborated on commits to improve the maintainability of example code, applying skills in Go programming, callback handling, and technical documentation to support more accurate and accessible onboarding for new users.