Newest to Node Js and javascript

i'm new to Node JS and javascript. Now everybody is saying to learn Node JS and javascript to develop a fastest, scalable and very good web application.

I thought of developing via Zk or Vaadin framework and experts says Node Js and javascript is far better than Zk or Vaadin

Could someone help with the thoughts and recommendation of which one to go and which one would be fast, reliable and scalable?

Like word press plugins, zk and vaadin components, Do we have a best java script framework which has huge components to integrate and create a beautiful and fastest responsive web app?