Personally I have dabbled in everything between C++ to Javascript and they all have there quirks and joys and for sure having knowledge in multiple languages does give me an insight as a developer that is good to have, but with that said I would argue that you should think what you want to create more and not focus on the languages.
Web developer? get a backend-language (PHP, C#, Node) and javascript
iOS developer? learn Swift and some understanding of Objective-C
Android developer? Java and Kotlin
Game Developer? C# for Unity or C++ for Unreal etc.
And so on...
Focus on what you want to work with or make and start there.
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Personally I have dabbled in everything between C++ to Javascript and they all have there quirks and joys and for sure having knowledge in multiple languages does give me an insight as a developer that is good to have, but with that said I would argue that you should think what you want to create more and not focus on the languages.
Web developer? get a backend-language (PHP, C#, Node) and javascript
iOS developer? learn Swift and some understanding of Objective-C
Android developer? Java and Kotlin
Game Developer? C# for Unity or C++ for Unreal etc.
And so on...
Focus on what you want to work with or make and start there.