It is important to understand the basics of any subject, not just programming languages. Let me explain with an example. I will be able to right a novel, a book, or a paper in a particular language only if I know the basics of the language. The basics are it’s alphabets, it’s grammar, sentence construction rules, etc.
To learn any programming language, one must study its character set, allowed symbols, grammar rules, and sentence meaning. Now one may wonder, do programming languages also have a grammar? Most certainly, they do. The grammar of a programming language is it’s syntax. The meaning of a statement of a programming language is it’s semantics. So, syntax = grammar and semantics = meaning.
The interesting point to note is that once you master the syntax and semantics of one programming language, it’s not very different for other languages. For example, C, C++, C#, Java all have similar syntax and semantics. Same is true for Python. Each programming language has its own unique features and nuances, which you must learn to write effective code. For example, Python has a very different approach to object-oriented programming than languages like Java and C++.
One you learn one language, other languages are similar and easy to learn.
Learning multiple languages can help a programmer develop a more diverse set of skills and perspectives, and can also help in identifying common patterns and best practices across different languages.