Welcome to the forum – great to have you here!
With regard to books, there’s a good thread that the forum members have been maintaining and contributing to for a while, listing the best books pertaining to Power BI and related topics.
However, as much as I love books, there are very few that I would classify as indispensable resources, given that Power BI Is updated every month often significantly. Thus most books on the subject become dated fairly quickly.
The two that I would say are indispensable are:
- The Definitive Guide to DAX, Second Edition by Russo and Ferrari
- Collect, Combine and Transform Data Using Power Query in Excel and Power BI by Raviv
Neither of these are beginner books, but great resources to have on your shelf as you progress.
In terms of specific error messages, your best bet would be to Google them first and if you don’t find a satisfactory answer that way, post your question on the forum here where there are tons of very knowledgeable people eager to help.
- Brian