Here's a case where the best way to learn is by doing. Select a scene from a story you're working on now or a scene you've been mulling over. Edit it first from the mind-set of the main character. Then edit from the mind-set of the next most prominent character on down the line until you've edited the scene once for each major character. The result will be a richer exchange with deeper characters who know and engage each other on a deeper level, and who may surprise the reader, possibly even the writer.
Here are a couple of caveats:
- Don't view this as a major rewrite of the scene, but more of a way to refine it to reveal the essence of each major player, and some minor ones, too.
- Don't let surprises throw you. Instead, step away from the work. When you return, if there still seems to be a major shift in character or plot, list the ways this will impact the story and where. Review the list to see if the changes are worth making.