There is the world of Hello Ruby [0], book(s) and other learning material translated into 20 languages. I think they are for younger kids. There is also some ma

There is the world of Hello Ruby [0], book(s) and other learning material translated into 20 languages. I think they are for younger kids. There is also some material for teachers. [0]:https://www.helloruby.com/ https://www.helloruby.com/