As you start to consolidate your Power BI knowledge it is vital that you understand the components of the Power BI Service that you are intending to use.
The Power BI Licencing model has an unfortunate tendency to lead you into the bad habit of creating a data model for each report. The thing to remember is that the benefits of Power BI are only really realised when you reuse your data models, making that simple change means that you are suddenly thinking about data as a resource rather than a report for a single use. The concept of data as capital is the corner-stone of a great Data Culture.