Ask HN: What tools and practices have helped you work better as a developer?

As title says. Comment below with any stories or observations on how productivity (or the lack of it) shaped your work!

PS: I'm working on a thesis on productivity in software development. If you have a few minutes, please share your experiences & what works (and what doesn't) in my survey: https://forms.gle/4B9GAtXD1nahwvn48