I wish to know what these are please? Can you guide me to some links on the MS Site - I want to understand more...
So far I have installed PowerBI Desktop (FREE), I have access to PowerBI Online Pro (part of my O365 Sub - I also have a 300 day eval going...) and I have no idea on what Premium EM 1/2/3 is - hence help required.
Earlier August we have also released Power BI Premium EM1, EM2, via Enterprise Agreement (EA) with yearly commitment. Power BI Premium EM3, and P1 are also available for purchase with monthly commitment via Web Direct. You can read more about the pricing tiers and plan your capacity requirements by reading the paper on How to plan capacity for embedded analytics with Power BI Premium.
You can research so common question about Power BI premium here, for example: How is Power BI Pro different than Power BI Premium? Why is Power BI Premium necessary? Do I need Power BI Pro to use Power BI Premium? etc.
And you can refer to some similar threads below.
Power BI Embedded vs Premium: Clarifications
PowerBI Premium EM1 Availability