There are a number of ways to copy data in Excel, but if you’re like me, you’re always looking for shortcuts that eliminate a few clicks. Here’s one that’s handy when copying a single column of values to an adjacent column:

  1. Select the column and the adjacent column. If the column of values is already selected, you can press [Ctrl]+[Shift]+[Right Arrow] to extend the selection.

  1. With both columns highlighted, press [Ctrl]+[Shift]+. (that’s the period character).

It’s quick and easy, and pressing [Ctrl]+Z will cancel the copy action. If the target cells contain values, Excel will overwrite them. If you press [Ctrl]+Z to cancel the copy, Excel will reverse the action and reset the cells to their original values.
This trick also works with rows: Press [Ctrl]+[Shift]+, (the comma character).