Can you recommend any good ressources to start learning power BI

I use PowerBI every day and there is no free way to learn (last I checked) because MS requires you to have a business account for it, even for their tutorial when I tried it. I recommend learning Salesforce and Tableau instead if you don’t have a corporate account. They are similar yet more sophisticated products (imo), so what you learn there can still transfer over to PowerBi and they have the best free tutorial / certificate platform I’ve ever tried called Salesforce Trailhead.

How about Microsoft's learning resources?

https://learn.microsoft.com/en-us/training/paths/power-plat-...

resources*

Humble Bundle may repeat certain bundles each year. Here are a couple past ones for Power BI:

Business Intelligence and Data Analysis with Tableau, Power BI, and More (Packt)

https://www.humblebundle.com/books/business-intelligence-and...

Business Intel (also by Packt)

https://www.humblebundle.com/books/business-intel-packt-book...