Lately I have been agonizing over how to learn ES6, and then I was introduced to Babel.
So I have taken first steps to learning ES6 by utilizing the Babel compiler on the Babel website. The Babel website also has a “Learn ES2015” section where you can learn more about ES6/ ES2015.
I had had a chance to learn how to contribute to Babel, which is an open source project, the other day. Sorry I didn’t!