Q:

Excel Worksheet_SelectionChange event not firing at all? (on both Office 2013 & 2016)

I've been having a heck of a time accomplishing what I thought would be an incredibly simple test. All I am trying to achieve is to pop up a MsgBox when a user selects a new cell or changes the contents of a cell.
I've been at this for about 6 hours and so far have zero success! I have identical behavior with Office 2016 (Windows 10) and with Office 2013 (Windows 7). 
Here are my method(s):

Create a new macro-enabled workbook.
Record a new macro in the workbook. Stop the recording. Open VBA.
Open the code for "Module 1" and replace the undesired code with the code below. Save the file.
File -> Options -> Trust Center -> Trust Center Settings -> Macro Settings -> "Trust access to the VBA project object model" is selected. Save the file.
I also have ensured Application.EnableEvents = True
I am expecting to be able to click on various cells, or edit cells, and received a MsgBox whenever the event occurs.

Here is my code:
Option Explicit

Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)       
    MsgBox "changed!"  
End

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    MsgBox "selected!"
End Sub

Public Sub Just_In_Case()
    Application.EnableEvents = True
End Sub

What am I missing? Is there a security setting preventing this action event? I have the same behavior online at work as I do offline at home.  
Thank you in advance for your help!  :)
PS Here is the screenshot of my VBA environment, if relevant: https://i.stack.imgur.com/yXkMK.png

A:

That Workbook_SheetChange code needs to be in the ThisWorkbook code module, not in a regular module.  
EDIT: and the Worksheet_SelectionChange goes in the Worksheet code module
http://www.cpearson.com/excel/events.aspx

