The substantive part of what you need to learn is the domain or problem that the tools apply to. Tools change, but problems are a lot more stable. (Maybe there’s more depth, though, so actually understanding things can take more time.) If you learn linear algebra, you can use or read about nx, numpy, R, matlab, and they’ll all make sense since they’re saying the same stuff. If you learn about graphics, you can pick up different graphics and video libraries in different ecosystems, and go backwards to learn the language that they’re a part of. (Or suggest substantive improvements where something is missing or needs work compared to some other ecosystem.)
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