When starting out it's probably best to focus on a single language and learn enough to be able to tackle any problem in it. From there we can decide to either specialize even more and become an expert in it that people go to for that language. Or we may decide we don't want to be an expert who may have to always deal with complex problems or expected to be one of the best with a language and learn a few things to be able to jump around.
Both ways have their own pros and cons. The nice thing is once you know one language well and have the core concepts down that knowledge easily transfers to the next language or technology.
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When starting out it's probably best to focus on a single language and learn enough to be able to tackle any problem in it. From there we can decide to either specialize even more and become an expert in it that people go to for that language. Or we may decide we don't want to be an expert who may have to always deal with complex problems or expected to be one of the best with a language and learn a few things to be able to jump around.
Both ways have their own pros and cons. The nice thing is once you know one language well and have the core concepts down that knowledge easily transfers to the next language or technology.