I like Egghead.io -- they seem to have quality material. I've also learned a ton from classes on Udemy.
For basic Javascript, this class was excellent: udemy.com/understand-javascript
javascript30.com/, es6.io All of the Wes Bos stuff is great...he covers Node/JS/React/Redux as well as other material and he's a great teacher. I've taken both free/paid courses from Wes.
decent study plan: medium.freecodecamp.org/a-study-plan-to-cure-java…
A study plan might be a good place to start, then you can figure out the resources that would best map to your plan, given the team's current skills or needs.