Vim: insert the same characters across multiple lines

Question

Sometimes I want to edit a certain visual block of text across multiple lines.

For example, I would take a text that looks like this:

name
comment
ph         


        

Answer 1

You might also have a use case where you want to delete a block of text and replace it.

Like this

Hello World

Hello World

To

Hello Cool

Hello Cool

You can just visual block select "World" in both lines.

Type c for change - now you will be in insert mode.

Insert the stuff you want and hit escape.

Both get reflected vertically. It works just like 'I', except that it replaces the block with the new text instead of inserting it.