Managing shared code across multiple projects often leads to code duplication and synchronization issues, especially when working with libraries or components used in several repositories. As the creator of CoreUI, I’ve managed complex multi-repository setups for component libraries, documentation sites, and enterprise applications. From my expertise, Git submodules provide the most reliable solution for including external repositories within your project while maintaining independent version control. This approach allows you to track specific commits of external code, ensuring consistency and reproducibility across your development workflow.