Most of us here debug for a living, and the habit that has helped me the most did not come out of software at all, it came out of lab method. The overlap is closer than it looks, so it seemed worth writing up for this crowd.
Change One Thing, Then Look
When a bug will not reproduce, the instinct is to bump the dependency, tweak the config, and add a retry, all in one pass. If it starts working after that, you have not fixed anything, you have hidden it. You now have four candidate causes and no way to tell them apart.
Lab work has the same rule and states it more bluntly: change one variable per run. If you alter the concentration and the temperature and the container at the same time, the result cannot tell you which change mattered. Software gives us the illusion that we can skip this because iteration is cheap, but the reasoning cost is identical.
Write Down The Raw Numbers, Not The Conclusion
The other borrowed habit is the notebook. Not a summary written after the fact, the actual numbers: input, timestamp, the exact command, what came back. The value shows up on run four, when a pattern appears that no single run would have revealed.
This is exactly the discipline that setting up a home lab forces on you, because there is no log aggregator to fall back on. Date, question, materials with quantities, procedure, raw results, and what surprised you. Six lines. Anyone who has tried to reconstruct a debugging session from memory a week later already knows why it matters.
Reproduce Three Times Before You Believe It
One passing run is not a fix, it is a data point. Race conditions, cache warmth, and machine state all produce green on the first try. Three clean runs, ideally on a cold start, is the cheapest form of replication available to us and it catches the fixes that were never fixes.
None of this is new, it is just the scientific method with different tooling. The parts we tend to drop are the boring ones: one change at a time, raw records, and repeat before believing. Those three are what make debugging cumulative instead of a loop.