How to enable dark mode in Microsoft Excel, including a spreadsheet's cells

You can use Microsoft Excel in dark mode to change elements of your spreadsheet to a darkened color palette.

How to lock cells in Microsoft Excel, so you need a password to change or erase data

You can lock cells in Excel by heading into the program's "Protection" tab. There, you can set a password, and protect your data.
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Editing a Formula in an Excel Dialog Box? Here's a Tip to Make Life Easier

By default, when you select a formula or source field in a dialog box, Enter mode is activated. You can see this in the ...
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This one Excel symbol will change how you write formulas

The best way to do this is by converting your data to an Excel table. Select your data range (A1:E11), press Ctrl + T, and click OK. Excel names it something like "Table1"; in my case, it's Table3, ...