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Enter and move down

Windows shortcut 
Enter
Mac shortcut 
Return

This isn't really a shortcut, but it's important to understand that pressing enter or return will complete a cell entry and move the cursor down by one cell by default. Using other keys (like the tab and arrow keys) you have the option to move the cursor in other directions after completing the entry in a cell.

Related videos

The videos below demonstrate this shortcut.
One of the most useful features of Excel Tables is that they create a dynamic range. In this video, we'll take a closer look at how table ranges work.
In this video, we'll look at how to create a radar chart. Radar charts can be used to plot the performance, satisfaction, or other rating data across multiple categories in a single chart.
In this video, we'll introduce the UNIQUE function. The UNIQUE function lets you extract unique values in a variety of ways.
In this video, we'll look at how to create a scatter plot, sometimes called an XY scatter chart, in Excel.
In this video, we'll look at how to generate a sequence of times with the SEQUENCE function.