Import vs. DirectQuery vs. Live connection. Which do you choose and why in Power BI? Adam looks at the three options when creating reports in Power BI Desktop including composite models.
Power BI Data Sources:
https://docs.microsoft.com/power-bi/connect-data/power-bi-data-sources
Star Schema:
https://docs.microsoft.com/power-bi/guidance/star-schema
DirectQuery model guidance:
https://docs.microsoft.com/power-bi/guidance/directquery-model-guidance
Composite Model guidance:
https://docs.microsoft.com/power-bi/guidance/composite-model-guidance
DirectQuery for Power BI Datasets video:
https://www.youtube.com/watch?v=ZSyYegfA6PQ