Tutorial from build calculation

Please request a step by step tutorial for beginners on how to build in field calculate from xlsmform.
I have a form with 76 questions, there are two questions or fields for dates, there is a third field that asks me for the difference in days between the two dates, I need this field to be automatic.
Let me explain when introducing the two requested dates in the two upper fields (questions), the difference in days can be automatically displayed in this third field without the user who is surveying doing it manually.

Thank you for your valuable support.

@Savechilds, we would appreciate it if you would avoid making multiple posts for the same issue. FYR:

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