Power Query M language
Power Query M Primer
- Introduction To Power Query M Code by John MacDougal
- Lists, Records and Tables in Power Query by Lars Schreiber
- Power Query M formula language by Microsoft
- Power Query M Primer (in 18 parts) by Ben Gribaudo
Power Query M Evaluation Model
- M Evaluation Model by Microsoft
- Power Query M Primer (Part 5): Paradigm by Ben Gribaudo
Power Query M Functions
- Understanding Power Query M functions by Microsoft
- Power Query M functions reference by Microsoft
- Power Query M Primer (part 2): Functions: Defining by Ben Gribaudo
Power Query M Error handling
- Power Query M Errors - the basics by Microsoft
- Power Query M Primer (Part 15): Error Handling by Ben Gribaudo
Power Query M optimisation
- Speed/Performance aspects of Power Query by Imke Feldmann MVP, the BIccountant.
- A guide to Power BI / Power Query performance tuning by SQLgene (Eugene Meidinger).
- Chris Webb’s blog - various articles
- Data reduction techniques using Power Query by Microsoft.
- DirectQuery model guidance by Microsoft.
- Composite model guidance by Microsoft.