Knowing a little about a lot of things allows you to generalize over them and learn new things faster. For example, if you have dabbled in C++, Java and Python

Knowing a little about a lot of things allows you to generalize over them and learn new things faster. For example, if you have dabbled in C++, Java and Python you are better placed to learn a new language than if you have exclusively used one of them. Even if your knowledge of that goes way deeper.