Nontechnical Founders: What are the gaps in your knowledge?

To all those nontechnical and non-programmer Entrepreneurs here on this great community, I have a single question: Having worked with developers on your Saas app, MVP product or something else, what are the gaps in your knowledge that you wish you'd known about when starting?

Your answer could be as simple as how servers work, what programming language to use, or as complex as "We shouldn't have done ABC because it cost us $X." Coming from the programming side, I'm interested in the pitfalls you experienced.

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