Setting file naming preferences in Lightroom

I'm going to open Lightroom's External Editing Preferences again, so that I can…show you the file name area at the bottom of the Preferences window.…Here you can control how files are automatically named when they are passed…between Lightroom and Photoshop, or Lightroom and an additional external editor.…Just above this little window at the bottom is the default file name convention…that will be applied if you do nothing here, and that's just fine.…In that case files that are rendered from a particular source file, I'll call…the resulting files derivative files, will take their file name from the source…file, and that will be followed by a hyphen and the word edit. And that makes…sense I think, because it will help you to know which source files and which…derivates of those source files go together, that have the same beginning number.…

And having the word Edit in some files will let you know that those are files…that are derivatives, ones that have been edited somewhere in the course of one…