Is it possible to master more than one programming language? And there Data Structures and algorithms?

Question

I am learning JavaScript, Python, Java and C++

Answer 1

Yes, it is possible to master multiple programming languages, and many people do. Besides, even if it had not been done before, would that discourage you from trying? With time, effort, and a little curiosity, it happens!

Data structures and algorithms are studied independently from specific languages. I would broadly assert that their concepts are the same, regardless of language. Once you learn them, they can be used in any language. However, some languages make implementation easier than others.