Quick, clean, and to the point

Enter same data in multiple cells

Windows shortcut 
Mac shortcut 

With multiple cells selected, this shortcut will enter the same data in all cells in the selection at once. This is a great way to skip a copy & paste step. Cells do not need to be contiguous; use Control (Win) or Command (Mac) to select non-contiguous cells before using Control + Enter.

Related videos

The videos below demonstrate this shortcut.
Although you can use Excel's AutoFill feature to fill in a series of dates and times, you can also do the same thing with formulas. The advantage of using a formula is that can easily change the starting value and generate a new series. Let's take a look.
In this video, we'll look at how to calculate the nth smallest or largest values in a range using the SMALL and LARGE functions. This would be for example the 1st, 2nd, and 3rd smallest or largest values.
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In this video, we'll look at how to create a named constant. This is a useful way to create a name that doesn't appear in a cell on the worksheet.
In this video, we look at how to use the REPT function, a special function for repeating text values with a numeric counter.