So you need to change a class name, list item prefix, variable name or some other text in many places. You could search and replace but, starting with build 20151008, there's a more convenient way:
Click inside the first instance of the text and keep pressing Ctrl+I until all matches (that you want to change) are selected. And then start typing and let all those items update at the same time. To go back to regular typing (and much more boring way of typing by comparison!), press ESCape.
You can get this feature now in TreeHouse build 20151008.
Also starting with this build, HTML-Kit Tools will display a few "quick tips" on startup along with the following visual reminder. You can of course tell HTML-Kit to not show them again but they're there to help newcomers discover some of the hidden features.