There are two main ways of adding keywords to many photos in Lightroom:

  1. The simplest way of adding keywords in Lightroom to your photos is to add them during the import.
  2. In the Library module, select all of your photos that you want to add keywords to.
    • Right-click on the keyword you want to add and select: Add this keyword to selected photos.

Lightroom: Adding Keywords To Selected Photos

Lightroom: Adding Keywords To Selected Photos