User level cmd script need's a little help

I'm working on a script and need a little help with it.
Please critique and make suggestion's to improve the script and what it does.

I would like "one-liner's" where possible.
Look's like it need's some 'tidy-up'.

The script is meant to be manually ran under the C:\Users directory.
It delete's unneeded file's from the source directories.
Move's needed file's to a destination directory.
Append's a file extension to each needed file.
Delete's empty subdirectories from the source directory.
Retain's the source and destination directories.

Can I keep this script in a Desktop folder?
Does this script need an upper level cmd prompt for it to work?
Which is better for a user level script such as this, *.bat or *.cmd?

When I first ran this script, I ran it from C:\Windows\System32.
Cmd (Admin) threw error's, question's and info messages at me.
These were such like...

"... [source directory, Are you sure? [Y] or [N]"

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"Cannot specify the system"

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"...Access is Denied"

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What would I append into the script to have cmd echo the line number and phrase within that line which cause's these message's?

I read on the internet that the "::" is another way of writing "rem".
The only info about the "::" statement that the the author of that tutorial was specific about is that whatever is behind rem and :: is ignored.
Is that true or are there some thing's going on such as what the help page seem's to suggest about rem?

The say's

Records comments (remarks) in a batch file or CONFIG.SYS.

REM [comment]

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Does it mean that line's beginning with rem is recorded in a file somewhere on the machine?
If so, what and where is that file and how would I prevent commands from being endlessly recorded?

The script...

You're calling it a Script, but it looks a lot like DOS Batch Language to me.
I do write batch files, like my "Windows11Cleanup.bat" program which I've talked about a lot on this and other forums, and I've shared with many members.
Save it with the .bat extension, to a folder on C:\ and then create a shortcut to your desktop, with "Run as Administrator" privileges.

As for the commands, as you've typed them, they look legit! That is if the paths and file names are correct.
But personally, I'm still at a loss as to what you're trying to do.

That one line looses me though. (del /s /q /a:- product*) It might make more sense to me, anyway, if it read, del /s/q/f C:\Product.*
The /a switch is used in reference to a certain file attribute. I don't see an attribute being specified.

Good luck,
TM

Yes, it is a DOS Batch language.
In my thinking, I believe the file as a whole is a script of some sort.

The original post specifies what I ran into and contain's a few question's.
Hopefully, those question's are answered very soon by other such file's
Or by members here