Everything I’d started (and I tried many resources) confused me to despair in just the first paragraph. Nothing was explained. Nothing.
I did not give up and finally found the Learn ES6 (ECMAScript 2015) course at Egghead.io
As is always the case with something that seems intellectually insurmountable, once I finally find a simple explanation of any given thing — in this case, for example, arrow functions or the “let” keyword — I shout, out loud, even if alone, “Why didn’t the dozens of others just say that?!”
Programming is so ridiculously easy with the right teacher(s).