On breadth vs. depth of technical knowledge

Whenever my colleagues and I discuss our career plans and the job market, someone always asks me whether to learn programming language X, or operating system Y, or framework Z. But I like to point out that time spent learning some new skill is also time not spent honing the skills you already have. And in my opinion, it is both more lucrative and more enjoyable to be a master of one craft, than to be mediocre at several of them.

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