Log changes (for specific column and giveback of a specific column) - excel

Question

I am hardly familiar with vba but now need an excel whose changes should be logged. I have now found the following code on stack, but still need two adjustments that I can not manage myself. I only need the monitoring of the column K (K2:K2000), if it changes something there that only that is logged. And if I always need the content of column A, for example if she changes something in column K33 then I want the value A33 as the seventh display in my log.
I tried to understand the code, but I couldn't do it myself.I found the following code on stack overflow:
Private Sub Worksheet_Change(ByVal Target As Range)
Dim RangeValues As Variant, r As Long, boolOne As Boolean, TgValue 'the array to keep Target values (before UnDo)
Dim sh As Worksheet: Set sh = Worksheets("Protokoll")
Dim UN As String: UN = Application.userName
'sh.Unprotect "" 'it should be good to protect the sheet
If sh.Range("A1") = "" Then sh.Range("A1").Resize(1, 6) = _
Array("Time", "User Name", "Changed cell", "From", "To", "Sheet Name")
Application.ScreenUpdating = False 'to optimize the code (make it faster)
Application.Calculation = xlCalculationManual
If Target.cells.count > 1 Then
TgValue = extractData(Target)
Else
TgValue = Array(Array(Target.value, Target.Address(0, 0))) 'put the target range in an array (or as a string for a single cell)
boolOne = True
End If
Application.EnableEvents = False 'avoiding to trigger the change event after UnDo
Application.Undo
RangeValues = extractData(Target) 'define the RangeValue
putDataBack TgValue, ActiveSheet 'put back the changed data
If boolOne Then Target.Offset(1).Select
Application.EnableEvents = True
Dim columnHeader As String, rowHeader As String
For r = 0 To UBound(RangeValues)
If RangeValues(r)(0) <> TgValue(r)(0) Then
sh.cells(rows.count, 1).End(xlUp).Offset(1, 0).Resize(1, 6).value = _
Array(Now, UN, RangeValues(r)(1), RangeValues(r)(0), TgValue(r)(0), Target.Parent.Name)
End If
Next r
'sh.Protect ""
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
End Sub
Sub putDataBack(arr, sh As Worksheet)
Dim i As Long, arrInt, El
For Each El In arr
sh.Range(El(1)).value = El(0)
Next
End Sub
Function extractData(rng As Range) As Variant
Dim a As Range, arr, count As Long, i As Long
ReDim arr(rng.cells.count - 1)
For Each a In rng.Areas 'creating a jagged array containing the values and the cells address
For i = 1 To a.cells.count
arr(count) = Array(a.cells(i).value, a.cells(i).Address(0, 0)): count = count + 1
Next
Next
extractData = arr
End Function