In that scenario I'd recommend learning javascript, react/redux, and css. And also SQL if they haven't worked with it. Why? They'd probably be fine with the se

In that scenario I'd recommend learning javascript, react/redux, and css. And also SQL if they haven't worked with it. Why? They'd probably be fine with the server side aspect of web development (writing an API or whatever), in any language. So concentrate on the browser stuff, for which react/redux is still the most in demand.