Publishing and sharing Power BI content
The content you create on Power BI Desktop cannot be shared while it is on Power BI Desktop. You can forward files around, but that will not be practical at all, especially with the data size and potential for multiple versions of the truth. Power BI Desktop is the only authoring tool for Power BI and needs to be treated as such. The Power BI service is where all Power BI content goes live, is shared, and is used.
Publishing Power BI content
All Power BI content published to the service is housed within workspaces, and so is content that is created on the service. Workspaces are where you would collaborate with your peers on the content before making it available to a wider audience.
Workspaces are usually created for different types of requirements. Think of the various types of analytical requirements that you would need to cater to. Then, think of how you can organize the content that you create for the requirements into workspaces...