Where can JS be applied?

Question

Node.js

Hello community.
Today there are many programming languages. It's good practice to learn a little bit of everything, but at the same time, I need a job, so I primarily focused on PHP/Python.
I'm learning a little C++ and just a little bit of Java.
Over time, I hear more and more about JS. It seems that they want to shove JS wherever possible.
Accordingly the question. Where can JS be used now? Node.js? How effective is it?
Thanks in advance!

Answer 1

In web development on the front and back mainly.