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>What level of knowledge of Power BI you expect (or required) in order to follow the presentation?

There are several reasons for doing this, one of which is to show the kind of content that someone can create with Power BI.

So even if you've never touched Power BI, you might still get something out of this.

Another objective is to talk about some of the themes that are common in many analytic applications (creating and accessing snapshot history, trend metrics, etc.)

Only actual "requirement" is an internet connection :)