Notes for a younger programmer

> whether it’s adding documentation, cleaning up syntax, or fixing an edge case.

If you're a junior/younger programmer make sure you have your edge-case fix properly reviewed by someone else who knows that chunk of the codebase.

With the best will in the world, unsupervised "edge cases fixing" can wreak bloody mayhem by introducing new edge cases. Been there done that.

What does "Decide what you’re willing to leave at work. Stick to it." mean?

I really enjoy your writing. Thanks for sharing!