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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.
In this video, we'll look at how to create a bar chart in Excel to show survey data. Bar charts are good for long labels, since there is plenty of room for text to the left of the bars. 
In this video, we’ll set up the XLOOKUP function with a basic example. Matching on City name, we'll retrieve Country and Population.
In this video, we'll look at how to create a pie chart in Excel. Pie charts show a "part to whole" relationship, and they work best with a limited number of categories.
In this video, we look at how to use VLOOKUP to lookup values in an Excel Table.
In this video, we'll introduce the UNIQUE function. The UNIQUE function lets you extract unique values in a variety of ways.