VBA-Excel: Cells Ranges Offset - Active Cell

ActiveCell, as the name clearly indicates that the cell which is presently active in your worksheet, in other words you can if u start typing the value u entered will go to active cell.

Example:

Function FnActiveCell()

         Dim mainWorkBook As Workbook

         Set mainWorkBook = ActiveWorkbook   

         mainWorkBook.Sheets("Sheet1").Activate

     ActiveCell.Value = 5

End Function

You can select a specific cell in worksheet which you want to be active. Use Range object along Activate method

Function FnActiveCell()

        Dim mainWorkBook As Workbook

        Set mainWorkBook = ActiveWorkbook

 mainWorkBook.Sheets("Sheet1").Range("A2").Activate

 ActiveCell.Value = 53

End Function

You can also change the ActiveCell by using the Offset property.

Function FnActiveCell()

        Dim mainWorkBook As Workbook

        Set mainWorkBook = ActiveWorkbook   

        mainWorkBook.Sheets("Sheet1").Range("A2").Activate

        ActiveCell.Offset(1, 0).Activate

          ActiveCell.Value = "New Cell"

 End Function 

Also Read:

1. VBA-Excel: UsedRange
2. VBA-Excel: Date-Time Functions – Hour(), Minute(), Second()
3. VBA-Excel: Copy/Paste data - Copy the Entire data from one sheet to another
4. VBA Excel - Cells, Ranges and Offset : Range
5. VBA-Excel : 3D-Ranges – FillAcrossSheets Method