I am fairly new to Macs and not exactly a "power user" so I was wondering if anyone could explain to me if it is ok/possible to clean up all the files that are stored in the Library/System folder when doing just about EVERYTHING on the internet. There are files from flash player, caches, preferences, and tons of other stuff I have no real idea about. I just see files from sites I visited who knows when and is just stored. Why? There are also files from applications and all kinds of stuff. Thanks for the help!