There are two ways to sort data in Excel. The easiest way is to simply select one cell in the column you wish to sort by. Then click the "Sort" button on the toolbar.
Note: If you accidentally select more than one cell, Excel will warn you that it is about to sort that range separate from the rest of the data (which wouldl obviously corrupt your data) and will give you the option to expand the selection. Be sure to allow Excel to expand the selection before you continue.
Another way to sort data in Excel, which gives you more control, is to go up to "Data" on the menu bar and down to "Sort". You can then choose which column to sort by and whether to sort in ascending or descending order. You can also sort by up to 3 columns.