[echolima]

...and there's the rub, isn't it? "free" All kidding aside, if you can afford a few bucks, look at the Wes Bos series.

[peller]

I didn't pay for his React series, but the free Redux series - while useful - I felt wouldn't have been worth paying for. Then again, I already knew React/Flux, so perhaps I wasn't really his target audience.

[echolima]

this comes highly recommended from a friend http://courses.reactjsprogram.com/p/reactjsfundamentals