How to batch change keywords?

Keywords are one of the corner stone of Lightroom. But to apply keywords one photo at a time is a killer. You can apply the same keywords to a "whole bunch" of photos in one fell swoop.

1. Switch to the Library | Grid View.
2. Select all the photos that you will change the keyword.
3. Got to the Keyword panel.
4. Either delete the right keyword or change the keyword you want.
5. Press the Enter key and Lightroom will apply the keyword change to all the selected photos.