Hi fellow devs!
I've been working as RoR developer since couple of years now. Recently I've decided to widen my skills with some frontend knowled...
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If you wanted to learn React. I guess this one is very good. I believe you can get it also for free
roadtoreact.com/. And for improving JS alone eloquentjavascript.net/ though I haven't read those two yet. I think it'll help you improve you Js skills.
Also on the React side of things. I think testingjavascript.com/ is a great course for learning how to build robust tested frontend applications. Generally the path is to usually learn the framework first and then test practices, but I think it is worth while to dive into the testing earlier on.
:) Good luck!