I finished all the lectures yesterday and passed today.
Thank you.
If your goal is to obtain the certification, I recommend understanding the concepts through this course and then getting a feel for the exam by solving the practice questions provided by Microsoft. (I was able to pass without looking at dumps... it's probably because it's a fundamental certification.)
I've taken a similar AZ-900 course on Ude*y as well, but this course was much better. I think it's because the explanations were easy to understand rather than just constantly summarizing concepts.
Also, I recommend watching all the demo parts without skipping anything. Questions like selecting icons in the Azure portal appear in the actual exam, and the content is helpful for using the cloud in the future.