https://javascriptforwp.com/product/learn-deeply-course/ https://es6.io/ https://reactforbeginners.com/ https://gutenberg.courses/development/ https://wpscholar.com/blog/should-i-learn-react-to-build-gutenberg-blocks/ https://vip.wordpress.com/2018/06/13/jumpstart-gutenberg-testing-transition-ramp/ To learn more, see our resource list for JavaScript for WordPress developers