Which course should i do first for Power BI ?

Hi everyone ! I have learned SQL from this platform now i am on Power BI.

The video lecturer just does his own thing without proper explanation of basic stuff he is explaining active and inactive relationships and drag one column on another in schema and inactive relationships are formed but if i try it on my power BI it doesn't happen, there are less tables in schema than previous video, earlier he talked about how to merge a column and selected multiple columns which i wasn't able to do throught chatgpt i found out i have to hold CTRL to do that and many small missed details, he didnt explained anyting about charts and starts writing formula for charts, i think i needed to know about how to build charts in power BI before writing userrelationship formula  Its like watching a project on yt on skills which we haven't mastered yet. 

Explanation in SQL was way better mentioning small detail and complete hand holding in the starting and later on slowly building our habit, what do i do ? i have to chatgpt everything in a video on how he performed certain actions and what's the logic behind it ? 

I am learning from "Power BI by Dimitar shutev" is this not the power BI course for first timers or do i need some pre requisite knowledge for this ??