https://twitter.com/dan_abramov
https://twitter.com/floydophone
https://twitter.com/ryanflorence
https://blog.risingstack.com/the-react-way-getting-started-tutorial/ (looks like a good overview and includes tooling)
https://github.com/petehunt/react-howto (helpful order of when to learn stuff)
http://www.2ality.com/2015/08/getting-started-es6.html (Newer JS version, so better language features)