need help

Check out the samples provide by PowerPivotPro as a copanion and excercies for thier book.  Much of it is written for PowerPivot in Excel but the data modeling is all the same

https://powerpivotpro.com/book-files/

Woudl also recommend thier book to learn the basics of PowerBI/PowerPivot, Dax, M, and the understanding of how different the paradigm working in this relational mindset that you really need to get the full benefit of PowerBI and avoid the Excel Paradigm pitfalls most newbies run into. https://powerpivotpro.com/the-book/

Also MS Provides some good examples to playing with established datamodels. Not in excel but here are a variety of samples provided by MS

Hi Titanic,

Based on my research, you could refer to this link https://docs.microsoft.com/en-us/power-bi/sample-datasets to get sample data.

Regards,

Daniel He