The good news is that it can all be broken down into view library, state management, transpiler, build tools, and test framework. Almost all of these tools fit

The good news is that it can all be broken down into view library, state management, transpiler, build tools, and test framework. Almost all of these tools fit one or more of these categories. If you pick the one or two most popular libraries from each of these categories and build a toy app using them, you'll be 90% of the way there. The stack listed in this article is the current vogue. If you're not already using webpack with react, I would recommend putting the time in to learning that. It's a beast and the documentation leaves a lot to be desired, so you'll have to supplement your education with a lot of google searches, but it's quite powerful and flexible. React has come to dominate the ecosystem so rapidly that for the medium term you're probably fine just sticking with that, and learning complementary tools like various flux or relay/graphQL implementations. Angular is the only other tool I regularly run into as a freelancer, but this is less and less often. Almost all the clients I've worked for in the last six months have wanted react. Of course there are many more exotic stacks that some people swear by, but if your goal is to cover the largest percentage of the job market possible, react and angular will get you there with a minimum of effort.