Inserting & Deleting

TypeText

Inserts the text at the beginning of the current selection.
The selection is turned into an insertion point at the end of the inserted text.
If Options.ReplaceSelection = True then the original selection will be replaced.

Selection.TypeText "some text"

This behaves exactly the same as typing some text at the keyboard.

TypeParagraph

Insert a paragraph mark at the beginning of the current selection.
The selection is turned into an insertion point after the inserted paragraph mark.
If Options.ReplaceSelection = True then the original selection will be replaced.

Selection.TypeParagraph

This behaves exactly the same as pressing the Enter key.

TypeBackspace

Insert a paragraph mark at the beginning of the current selection.
If the selection is an insertion point, delete the character in front of the insertion point.
If something is currently selected then the selection is turned into an insertion point at the beginning of the current selection.
If Options.ReplaceSelection = True then the original selection will be replaced.

Selection.TypeBackspace

InsertBefore

Inserts the specified text before the Range or Selection.
After the text is inserted, the range or selection is expanded to include the new text.

objRange.InsertBefore(Text:="hello world")

If the selection or range is a bookmark, the bookmark is also expanded to include the next text.
You can insert characters such as quotation marks, tab characters, and nonbreaking hyphens by using the Visual Basic Chr function with the InsertBefore method.
You can also use the following Visual Basic constants: vbCr, vbLf, vbCrLf and vbTab.

This example inserts the text "Solutions" (enclosed in quotation marks) before the selection and then collapses the selection.

With Selection 
    .InsertBefore Chr(34) & "Solutions" & Chr(34) & Chr(32) 
    .Collapse Direction:=wdCollapseDirection.wdCollapseEnd 
End With

This example inserts the text "Introduction" as a separate paragraph at the beginning of the active document.

With ActiveDocument.Content 
    .InsertParagraphBefore 
    .InsertBefore "Introduction" 
End With

This example inserts all the font names in the FontNames collection into a new document.

Documents.Add 
For Each aFont In FontNames 
    With Selection 
        .InsertBefore aFont 
        .Collapse Direction:=wdCollapseDirection.wdCollapseEnd 
        .TypeParagraph 
    End With 
Next aFont

InsertAfter

Inserts the specified text after the Range or Selection.
After the text is inserted, the range or selection expanded to include the new text.

objRange.InsertAfter(Text:="hello world")

You can insert characters such as quotation marks, tab characters, and nonbreaking hyphens by using the Visual Basic Chr function with the InsertAfter method.
If you use this method with a range or selection that refers to an entire paragraph, the text is inserted after the ending paragraph mark (the text will appear at the beginning of the next paragraph).
To insert text at the end of a paragraph, determine the ending point and subtract 1 from this location (the paragraph mark is one character), as shown in the following example.

This example inserts text at the end of the active document. The Content property returns a Range object.

ActiveDocument.Content.InsertAfter "end of document"

This example inserts text at the end of the selection and then collapses the selection to an insertion point.

With Selection 
    .InsertAfter "appended text" 
    .Collapse Direction:=wdCollapseDirection.wdCollapseEnd 
End With

This example inserts text from an input box as the second paragraph in the active document.

response = InputBox("Type some text") 
With ActiveDocument.Paragraphs(1).Range 
    .InsertAfter "1." & Chr(9) & response 
    .InsertParagraphAfter 
End With

InsertParagraph

Replaces a Range or Selection with a new paragraph.
After this method has been used, the range or selection is the new paragraph.

objRange.InsertParagraph

If you don't want to replace the range or selection, use the Collapse method before using this method.
The InsertParagraphAfter method inserts a new paragraph following a Range or Selection object

InsertParagraphAfter

InsertParagraphBefore

Insert text at start of document

Set objRange = ActiveDocument.Paragraphs(2).Range 
objRange.Collapse Direction:=wdCollapseDirection.wdCollapseStart 
objRange.Text = "start of document"

Set objRange = ActiveDocument.Range(Start:=0, End:=0) 
objRange.Text = "start of document"

Set objRange = ActiveDocument.Range 
objRange.StartOf Unit:=wdUnits.wdStory, _ 
                 Extend:=wdMovementType.wdMove 
objRange.Text = "start of document"

Insert text to the end of a document

To insert text at the end of a document, you can collapse the range to the end using wdCollapseEnd

Set objRange = ActiveDocument.Paragraphs(2).Range 
objRange.Collapse Direction:=wdCollapseDirection.wdCollapseEnd 
objRange.Text = "end of document"

Set objRange = ActiveDocument.Range 
objRange.EndOf Unit:=wdUnits.wdStory, _ 
               Extend:=wdMovementType.wdMove 
objRange.Text = "end of document"

To refer to the insertion point immediately after the tenth character, set the character position to 10.

Set objRange = ActiveDocument.Range(10,0) 
Set objRange = ActiveDocument.Range(9,9) ??

The end paragraph mark is actually counted as a character when you use:

ActiveDocument.Characters.Count

In general

iTotalChars = ActiveDocument.Characters.Count 
Set objRange = ActiveDocument.Range(iTotalChars - 1, iTotalChars - 1)

To insert text into a document without replacing existing text use a Range or Selection object that represents a single location (i.e. whose start and end points are equal).
This is easily obtained from an existing range, using the Collapse method

objRange.Collapse Direction:=wdCollapseDirection.wdCollapseStart 
objSelection.Collapse Direction:=wdCollapseDirection.wdCollapseEnd

Deleting Text

Backspace

Selection.TypeBackspace 
Selection.Delete Unit:=wdUnits.wdCharacter, Count:=1