Here is a link to a topic where I talked about how I use Keywords.

Like many aspects of Scrivener, Keywords are both powerful and flexible, allowing many different approaches to meet the demands of the individual user. The flip side of this, however, is that they can be daunting to the new user and left as something to figure out later. Yet with a bit of planning up front they can make finding your way around a long manuscript much simpler and take (some of) the stress out of the editing process.

Thanks, that’s a great outline of how you use Keywords. Noted