What’s something you’ll always do a certain way because one of your jobs taught you to do it that way?

For me, it’s bagging groceries. When I was in high school, I worked at my local grocery store as a bagger. They taught us to bag customers’ groceries “properly.” Meaning, cold items with cold items, toiletries with toiletries, cleaning supplies with cleaning supplies and so on and so forth. 18 years later, I still do that.
What’s something you’ll always do a certain way because one of your jobs taught you to do it that way?
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