For bowling, the underlying is basic physics, something that is never going to change, never go away. For technology or tools, the underlying specifics are goi

For bowling, the underlying is basic physics, something that is never going to change, never go away. For technology or tools, the underlying specifics are going to change insanely fast, so if you are learning it, you will need to unlearn soon (and learn something else). So should you learn internals of libc? STL? JVM, bytecode? rt.jar? .NET CLR? V8 JIT?