Here's something nobody tells you when you start Power BI: the visuals are the easy part.
You can figure out a bar chart in ten minutes. But the moment your data comes from more than one table and nothing is adding up correctly, that's where most beginners quietly panic. I know I did.
Relationships and joins. Here's what they actually mean.
Why Your Tables Need to Talk to Each Other
Imagine you work at a retail shop. You have two lists:







