A few days ago I asked on Twitter what is harder than coding. My answer would be poverty, raising children (although I'm not a parent), communicati...
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Here's my answer on that tweet:

I remember a saying like this, "if you think what you did is easy, show to people how it's done". Writing docs will prove you a point if it's actually easy or not.
But it isn't hard
Well, many people find it hard...
For example swimming, some people think it's easy some people not!