So far, I've been quite happy combining three JavaScript resources:
- "world's biggest book" - JavaScript - The Definitive Guide by David Flanagan - 2011 is the latest edition that I'm aware of, nearly 1100 pages.
- WordPress JavaScript coding standards - http://make.wordpress.org/core/handbook/coding-standards/javascript/
- Googling like you do with a specific question in mind, and browsing the code shown as a solution
Overall, despite its strongly Object-Oriented approach, JavaScript uses a lot of similar language constructs to PHP.
I just completed the coding for (my first attempt at) the (full) Proof of Concept, but it hangs WordPress, so I am now learning how to debug when JavaScript is involved.