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Official references and free tools to keep open while you work.

References

DAX function referenceSyntax and examples for every DAX function.
Power Query M referenceEvery M function, for steps the buttons can’t do.
Power BI guidanceMicrosoft’s best practices for modeling, DAX and performance.
Star schemaHow to shape a data model. Worth reading twice.

Certification

PL-300: Power BI Data AnalystThe exam page, with a free practice assessment.
PL-300 study guideThe list of skills the exam measures.

Free tools

Power BI DesktopThe real thing, for Windows. Rebuild what you practice here.
DAX StudioRun DAX queries and see how fast a measure is.
Tabular Editor 2Edit many measures at once.

Practice data

Power BI practice dataThe lesson dataset, column notes and 10 practice questions.
Microsoft sample datasetsFinancial Sample, Contoso and more.

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