Programming languages—the ones you’re likely to encounter, anyhow—are simply not all that different. At some point, that new language you’re picking up isn’t all that new any more.
In the first you must Learn professionally at least one strong language.
This tells us far more about popular languages than about experienced programmers.
For me the best languages / C / Java / Delphi or Pascal / C++
You can easily write libraries in C and with that you can harvest the power of C to the language you already know.