Clarified how format-table uses a hash table that utilizes a script block

demos/day2/05-format_cmdlets.ps1

-# Displaying certain properties
+# Displaying certain properties
 Get-Service | Format-Table Name, Status
 
 # Change Column Headings
-$cols = @{express = { [int]($_.Length/1KB) }; Label="KB" }
+$cols = @{Label="KB"; Expression = { [int]($_.Length/1KB) } }
 Get-ChildItem | Format-Table Name, $cols
+# The above hash table feeds into a format that the Format Table cmdlet will accept.  
+# The hash table is made up of two fields; `Label` and `Expression`.  
+# Of note, `Expression` is a script block, and will place its resulting output on the field designated by `Label`.  
+# As `Format-Table` will process objects off the pipeline, it can interact with the `$_` automatic variable.  
+----
+Source: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/format-table?view=powershell-5.1
+----
+
 
 # Grouping using formatting cmdlets
 # Group by extension
-Get-ChildItem | Format-Table -GroupBy Extension
\ No newline at end of file
+Get-ChildItem | Sort-Object -Property Extension | Format-Table -GroupBy Extension