Free online classes:
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Power BI Web Service Navigation: https://medium.com/@powerbicourses/navigating-the-power-bi-service-for-new-users-28a87b76a9f3
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Power BI Tutorial (Introduction): https://www.youtube.com/watch?v=VaOhNqNtGGE
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Star Schema: https://www.youtube.com/watch?v=vZndrBBPiQc
Paid online classes:
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Microsoft Power BI Desktop for Business Intelligence: https://www.udemy.com/course/microsoft-power-bi-up-running-with-power-bi-desktop/