Angular seems to be out the door, with Vue being the "new Angular". And although this shift seems to be occurring, React still dominates the market, particularly at larger scales - since Vue doesn't seem to handle complexity as well as React.
At the end of the day though, learn Javascript.
It's the basis for all these languages, and 99% of the problems you'll discover in the libraries will be fundamental flaws in your understanding of Javascript. Particularly with React, since developers love to use ES6 with it, which is so fresh that most devs are still leaning on Lodash and jQuery for things ES6 accomplishes. Once you have a great understanding of the base language, you'll have an easier time integrating these libraries and frameworks into your workflow -- and it'll make way more sense what's happening under the hood (so it seems less like magic, more like yet-another-JS-lib).