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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. 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.
In this video, we'll look at how to dynamically highlight high and low values in an Excel chart using data labels.
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 make a stacked area chart. Stacked area charts are useful to show changes in a part-to-whole relationship over time.
In this video, we show you how to edit a formula you've already entered.
In this video, we'll go over some common options for configuring a pivot chart.