Eggheads just recently uploaded a new version of their React-Router course. It is specific to React-Router but worth watching, although it is only free for a while. But all the more reason to check it out now.
I particularly enjoy the Egghead courses. Had a lot of positive experiences there, including the first React course that made sense, was up to date, and short without hours of extra chaff, like so many courses are in places like udemy.