might as well ask how you become the best author in the world. Same question.

But I don't want to be the greatest author, I want to be greatest programmer!

Maybe this thread was too ambitious. How about just becoming a great programmer? How would a mediocre programmer could become much better?

idk. It depends on what field of programming you're trying to do. Also how you define programming. It's a really vague thing to want to be good at.

You'll be fortunate if you can count yourself as a 10X programmer.