From the Copy Finder Items "To:" menu, select "New Variable" and give it an appropriate name. Then after that, you can use the Set Value of Variable to set the value of the newly created variable. Note that you must do this above your Copy Finder Items action so that the variable is set before the copy operation happens.
It is possible to simply Drag and Drop the Applications folder (or any other folder for that matter) under the Favorites sections of the Finder Sidebar. Just locate the desired folder in the Finder window, and drag and drop it under the Favorites section of the Sidebar.
Once added, it is also possible to reposition any item, again simply using drag and drop....
If you just want to hide it from Finder, open your Console and execute the following command line in your Home directory:
chflags hidden ./Music
The directory is still there, however, Finder will not display it as it is marked hidden.
If you change your mind, then:
chflags nohidden ./Music
For complete chflags documentation, type:
https://www.charlessoft.com has Pacifist. You can use it
if you want to inspect a downloaded package to see what it will install before installing it.
allows you to extract individual files and folders out of [.pkg package files, .dmg disk images, and .zip, .tar, .tar.gz, .tar.bz2, and .xar archives]
There's also a Quick Look extension. So you ...
Here's one that people often overlook: BetterZipQL. This is a free module for Finder's "QuickLook" function and allows its Preview pane to show you the contents of an archive just as if it were a folder full o' files.
They're hidden files & folders.
Since Sierra you can toggle visibility simply using Cmd ⌘ Shift ⇧ . [period]
Prior to Sierra you would need to toggle visibility in Terminal or by script & then kill the Finder to make the changes register.
See How to show hidden files on mac without Terminal for the scripted method.