Do I really need extensions when learning Core Java?

Absolutely you should use basic extensions like 'Language Support for Java' by Red Hat! They really help with things like syntax highlighting, catching errors early, and offering autocomplete suggestions. These tools enhance your learning without replacing the need for understanding the concepts. Just be careful not to overload your setup with too many extras that might do too much of the work for you.

With a pretty old PC like yours (11-12 years, i3-4th gen, 6GB RAM), IntelliJ or Eclipse might feel a bit heavy. VS Code could be your best bet for smoother performance. Just make sure you've got those essential extensions to help you along.

I think using Visual Studio Code without these extensions will limit your experience. If you’re familiar with VS Code, it can be okay, but honestly, you might find IntelliJ or Eclipse to be better options overall. It really depends on your comfort level!