I'd add: over-verbosity, or conversely, seeing terseness as a goal in itself. A pet peeve on a smaller order: bad variable/function naming in beginner examples

I'd add: over-verbosity, or conversely, seeing terseness as a goal in itself. A pet peeve on a smaller order: bad variable/function naming in beginner examples. Hypothetical: You're writing a true beginner tutorial introducing the core concept of fooKinetic in your cool new gaming language. Many authors choose variable and function names similar to the concepts they're introducing, which adds unnecessary cognitive load for those who can't yet automatically visually parse the language. Someone who's looked at the code even for a couple of hours completely understands what `fook | fook ~~ fooKin | fook –– Fook{}` means, but to a complete language beginner, it's nonsensical. You lost an opportunity to reinforce your basic syntax, didn't communicate the core concept of the tutorial, and likely turned off people closer to the beginning of their coding journey.