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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 apply conditional formatting to a table with a formula.
In this lesson, we cover shortcuts you can use to to enter data in one or more cells at a time. Knowing these tips can really speed up editing in Excel.
In this video, we'll look at how to create an Excel Table from source data on a worksheet.
In this video, we'll look at how to build a combo chart. A combo chart is a name for a chart that combines more than one chart type.
In this video, we look at how to use VLOOKUP to lookup values in an Excel Table.