Which programming language is best for learning System Design?

I’m planning to start learning System Design, but I’m a bit confused about which programming language I should focus on for it. Most of my experience so far is with C++ and JS, but I often see people discussing system design using Java, and recently many developers also recommend Go.

As someone who is just starting with System Design, I wanted to ask:

Is learning System Design with C++ a good choice? Is Java generally preferred for System Design interviews and learning resources? Should beginners consider Go since many modern systems use it? Or does the language not matter much, and the focus should mainly be on concepts and architecture?

I’d really appreciate guidance from people who have already gone through this journey.

Thanks!