I recently started learning threejs through Bruno Simon excellent online course and had a great time, the course is great, easy to follow, and well structured and at least for me the immediate feedback loop of writing a few lines of JS and seeing something happen in the screen is very rewarding and a change from what I do for a living

I also recommended it to a friend in a similar situation to yours and he liked it too

For context, my background is around system administration, and had spent the last years writing k8s YAML for a living :P

Just in case, I'm not affiliated with Bruno in any way, just a happy student!