Direct Query Limitations - Power BI Certification

[dannycalvo]

I am taking a preparation course for the Power Bi Certification on Coursera. The course has so many examples regarding how to connect to online databases, set your data for direct query, create composite data bases, and also setting your preferences for data updates. Unfortunately, all of those require an online database I can access and play with. How can I make that work affordably? Unfortunately, the course does not provide access to those resources.