I'm interested to work on google facebook amazon Netflix

Question

But which language can I study to work this company?

Answer 1

You should look at the job advertisement of these companies. Google has more than 7000 open positions... Such large companies are always hiring. But depending on the position, their entry barriers can also be challenging.

https://careers.google.com/jobs

Answer 2

Why don't you ask these companies which skill sets they value, then you will have accurate information.

And they will know of your intent

Answer 3

You can learn any language you like, such companies specialize in different areas of IT. It would also be nice to think analytically and understand algorithms and data structures.

But do not forget that the ability to progress despite difficulties, as well as teamwork, is more important than high intelligence alone. So it is not enough just to know the programming language.