React JS

Using React is one of the most fastest JS frameworks on the planet. Netflix uses them. It's like using V6 engine. Learn react. You can find resources on google.

The ReactJS is a best framework for wonderfull UI. But i think is very hard to know...

Very interesting, it is a niche of constant growth, I will research more

Yes and check also react native for native apps
React is a great framework but personally I prefer angular

I like reactjs, Netflix is not alone, fb, uber, paypal, airbnb and other bigs use it

react has a bigger ecosystem and community, i like follow airbnb structure and components haha :D