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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 make a 100% stacked area chart. Stacked area charts can show changes in a part-to-whole relationship over time.
In this video we'll look how to use the XLOOKUP function with Boolean logic to apply multiple criteria.
In this video, I'm going to show you how you can use multiple Excel functions to split, manipulate, and rejoin values inside a single formula.
In this video, we'll look at how to count the unique values returned by the UNIQUE function, together with other functions like FILTER and COUNTA.
In this video, we'll look at how to create a list of random times with the RANDARRAY function.