We live in a time where technology is rapidly evolving. Developers have a thriving job market, with over 500 programming languages in use around the world. All languages have advantages and disadvantages, and their implementation is becoming increasingly application-specific.
Skilled programmers are not only aware of how to code, they know how to tackle a complicated problem with their brains and create effective code to solve it. Although most programming languages can perform most tasks, each has its own set of advantages and disadvantages. Knowing several languages is beneficial because you will not be able to achieve the same results with each one. You would have a larger depth of knowledge and be more likely to be able to solve complex problems quicker more effectively if you learn more languages.