Many outstanding programmers were asked, "What are the basic skills required to be a good programmer?" Lots of good and useful answers were given to this question, such as, test before coding, use a particular tool, or use Agile methods.
For me, though, with more than 60 years of programming experience, the one thing that made me a better programmer was my ability and willingness to examine myself critically and do something about my shortcomings. And, after 60 years, I'm still doing that. You could say it's incremental development applied to myself.
I also examine my strengths (long-comings?) because I know that my greatest strengths can quickly become my greatest weaknesses.
For instance, one of my great strengths as a programmer was speed. If something had to be done quickly, I was the guy to do it. But the weakness in my speed was my tendency to omit the last few hours of testing that would make the project rock solid. I had to learn the importance of taking the time to do a precision job.
Many programmers do examine themselves critically, but then they work to improve their greatest strengths, to the exclusion of their weaknesses. That practice takes them a certain distance, but the nature of computers is to limit your ability, by highlighting your greatest weaknesses.
A computer is like a mirror of your mind that brightly reflects all your poorest thinking. To become a better programmer, you have to look in that mirror with clear eyes and see what it's telling you about yourself.
Armed with that information about yourself, you can then select the most useful external things to work on. Those things will be different for you than for anyone else, because your shortcomings and strengths will be unique to you, so advice from others will often miss the mark.
Good programmers make good use of their best tools, and you are your best tool, so sharpen yourself.
See, for example,
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