While I can understand learning from a course will be effective, I recommend you start learning it right away.
I am currently using Elementor in my client sites. I would suggest you to create a local WordPress development environment and install Elementor. Once done, try experimenting it and I can assure you will know the A-Zs of Elementor within a week. I have worked with so many page builders for Wordpress and Elementor is by far the easiest among them all.