I would like to work as as freelance in a few month. I am sure of my skills and three.js won’t be my main langage at all but I like it. In consequence, is it a good things to do the bruno simon’s course :Three.js Journey — Learn WebGL with Three.js and to show it ? I saw some others freelances have done it.
The course is very good and very popular - but do keep in mind finishing it is only a good start. If you look at it as an investment of “I will pay $99 and get a job in 1-2 months!”, you may get a bit disappointed
Three.js is quite niche in terms of commercial applications - and finding work focusing on 3D is generally quite way harder than finding react or vue roles.