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The Best Truth Is Data
Information is not an argument, it's a conversation. As a developer, having the ability to remove personal feelings about what you think a workbook should be will take you far in you career. Always be mindful that your end users may simply want the freedom to drive their own story in an easy-to-use format. And that's perfectly fine. Not everyone is going to dedicate the time that is needed to be an Excel expert like you. But when they start asking questions about inconsistencies within the data, speak softly and carry a big data validation stick. You're going to need it.
WATCH OUT!
In a world of instant gratification and "I need this done yesterday," it's difficult to consistently check your work. Being the mad data scientist that you are, you would prefer to double-, triple- and even centuple-check your workbook before releasing it into the wild. Well, what if I told you that you could be both thorough and efficient? Go on... All you have to do is watch.
To Err Is Computational
You will never learn more about Excel than on the day you inherit a broken workbook. You're tasked with uncovering the method to the original author's madness, and if you're not careful you can get lost trying to understand why the author did things the way they did instead of finding the solution.