BuddyPress.org

I see those files (site-wide-sample.css and custom-sample.css) in the bphome folder. If I change those, do I put them back to the places where they currently reside? Does the bphome folder control the look of these other parts of the site? I’m confused about which files control which parts of the site. If there is some kind of structural documentation on BuddyPress, showing which parts files are controlling, that would be great. It isn’t transparent enough from the structure of the files themselves (at least not for a non-programmer). Thanks!