I’d agree that if you’re looking to have a career in front-end your order should be some JavaScript, then React/Angular and possibly Typescript, but after that I’d still recommend you go back and really learn JavaScript. It doesn’t often happen but sometimes you run into a situation where that knowledge does come in handy. You can introduce bugs in your React code if you don’t understand closures for example, to use a library like redux-saga you need to understand generator functions, you may run into code where you need to know how the “this” keyword works, etc. A more junior dev needing help with those is fine, but I’d expect a senior dev to be able to navigate those type of situations on their own most of the time.