Creating dbt packages involves understanding the distinction between internal and external packages, and the process includes defining package types, building and testing code, and eventually sharing the package with the community. Internal packages are tailored for specific organizational needs, promoting efficiency and best practices, while external packages are designed for broader use, requiring a more generalized approach. The guide provides a step-by-step approach to building a dbt package, from initializing a new dbt project and configuring the dbt_project.yml file to defining variables and using built-in dbt macros for cross-database compatibility. Testing locally is crucial before deploying the package publicly, which involves creating a GitHub repository, writing a README, and eventually releasing the package on dbt hub. The process encourages contributions and feedback from the community, leveraging open-source collaboration to refine and enhance the package's utility.