When I start learning about a new topic, I usually watch a video course on Udemy which covers a wide range of the topic.
What is your favorite Udemy course?
The one I learned the most about a topic was probably Angular - The complete Guide by Maximilian Schwarzmüller a couple of years ago. The course really helped me to get into the world of Angular. Even now it is getting updated and a helpful resource for me.
But I also enjoyed Spring 5 Framework - Beginner to Guru by John Thompson a lot.