Microsoft Power BI Complete Reference

Transform basics

Applying data transformations within the Power Query Editor can be a surprisingly simple thing to do. However, there are few things to consider as we begin this process. The first is that there are multiple ways to solve a problem. As you work your way through this book, the authors have tried to show you the fastest and easiest methods of solving the problems that are presented, but these solutions certainly will not be the only ways to reach your goals. 

The next thing you should understand is that every click you do inside the Power Query Editor is automatically converted into a formula language called M. Virtually all the basic transforms you will ever need can be accomplished by simply interacting with the Power Query ...