You mention in this video the placement of a button, and that it doesn't matter which section of the form you place it in. Could you explain when this would have an impact on the functionality of the form, be it for a button, or a combobox, etc.?

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Reply from Richard Rost:

It generally does not matter whether you place a button in the form header, footer, or detail section. If it's a continuous form, placing it in the detail section will show you multiple copes of that button. It's mostly just for aesthetics. There are some minor differences in functionality, but I'll discuss those in more advanced classes (too much to go into here).