After a basic React course, I went on to learn some Redux, and chose again a Wes Bos course, both because I really liked the React one and because not only is free but also encouraged by the author to be taken just after the React one.
Learn Redux is a 2.5 hours course in which we'll build a simple Instagram clone by using React, React-Router and Redux. We learn how to use reducers, stores and connectors, reading initial data from some instagram JSON dumps but then operating with React state (using stores).
Again feels like magic how easy and simple everything feels when it's well explained. You can't beat the price, but still I think was more than worth the time to do it. Probably there are lots of advanced topics but I think I now kow the basics to build React SPAs.