Fantastic article Tomasz, you really hit a few points that I think are critical for everyone to know. My favorite is "Have a deep understanding of what you are building and why". So many folks enter this industry thinking that it's all about cranking out code for 8-10 hours a day.
It's really not. It's about building just the right things with just the right amount of code to make the lives of your users easier. It's not about the tech, the language, how much code you write, etc. It's about answering the question, does this solve the user's problem? Sometimes, solving that problem doesn't even require any code.
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