Hi Roby,
Here’s some ideas for you
This is where I would recommend to start
‘Ultimate Beginners Guide to Power BI’
‘Ultimate Beginners Guide to DAX’
Then work through these 3 modules
After getting through these, you can move to a range of specific training modules that focus on more advanced areas of Power BI development
These are the key ones below
From there you can utilise the other videos and content ad hoc, that is how they’ve been created to be used.
The key is to start building and developing you own models and then revert back when you need some revision.
You can also use the support forum as you go.
Let me know if any further questions.
Chrs