What one tip changed your coding skills forever?

Practice finishing. Real artists ship.

Stubbing out practice problems and writing one of what should be 3 modules is fine for learning a concept. But to produce an end result you need to be able to finish.

The way you get good at finishing is to practice finishing. Do real projects, not sanitized conceptual exercises.

You see this in data science all of the time. Take a recent grad, give them a Kaggle dataset and watch them go. Take the same grad and give him production data streams and more often than not, you're going to be doing a lot of hand holding.

Quality work produces artifacts. This website, that data tool, this game.

There is a saying in dev, “we've finished the first 90%, now to just finish the second 90%”

Finishing gives you practical experience in 'the other 90%’