There are a few different types of events that can occur in an Excel worksheet:

• Cell Change Events: These events happen when a user changes the value of a cell. They can be used to trigger other actions, like recalculating formulas or running macros.
• Worksheet Change Events: These events happen when a user modifies anything on the worksheet, including cells, ranges, and charts. They can be used to track changes, or to trigger other actions.
• Selection Change Events: These events happen when a user selects a different cell or range of cells. They can be used to trigger other actions, like running macros.

You can use worksheet events to automate tasks in Excel. For example, you could use a cell change event to recalculate formulas whenever a user changes the value of an input cell. Or, you could use a selection change event to run a macro whenever a user selects a different cell. There are many possibilities for how you can use worksheet events to automate tasks in Excel.

To set up a worksheet event, you first need to open the Visual Basic Editor (VBE). You can do this by pressing Alt+F11 on your keyboard, or by going to the Developer tab on the ribbon and clicking Visual Basic. Once the VBE is open, you'll need to find the sheet where you want to set up the event. If you can't see your sheet in the list of sheets on the left-hand side of the VBE, double-click on ThisWorkbook, and then find your sheet in the list of sheets that appears.

Once you've found your sheet, double-click on it to open its code module. Then, find the Worksheet_Change event procedure in the code module. If there isn't one already, you'll need to add it. To do this, go to the Insert menu and click Module. This will insert a new module into your workbook. Then, copy and paste the following code into the module:

Private Sub Worksheet_Change(ByVal Target As Range) 

    'Your code here 
    
End Sub