Of course, you’ll still need to write down good HTML and CSS… but you’ll never be able to build a modern, scalable, maintainable and performant web application without a good JavaScript knowledge.

As I said, in the past we used jQuery to build user interactions… today it should be deprecated for React/Vue/Angular, ’cause jQuery code will never be as maintainable, clean, scalable (etc) as modern JavaScript (React/Vue/Angular) code.

Of course, if you’re writing a small web page, you probably can not care about these things (I still can’t find the reason why): but if you’re working on a bigger webapp, modern JavaScript knowledge is a must!