How to edit multiple locations simultaneously in Vim

Question

In certain text editors, like E, I can select multiple locations and, as I type, all the selected locations get replaced with the characters I am typing.

For example i

Answer 1

Here's how I would probably edit those particular lines (there are many ways):

/""
aText to replace...
n
.

First, search for the empty quotes to put the cursor on the first one. Using the "a" (append) command, type the new text to put inside the quotes. When you're done, use "n" (next) to go to the next instance, and "." (repeat last command) to insert the same text again. Repeat the "n ." as many times as necessary.

This method takes less up-front preparation and lets you get started right away without identifying ahead of time all the locations where you might want to add the text.