Both -r and -R are aliases for --recursive, which the manpage describes as:

remove directories and their contents recursively

If you do rm -r file1 file2, the option is passed to both files. Since the recursion only applies to directories (you can't recursively act on a single level), this would do little more than delete both files.

If you do rm -r folder1 folder2, it will recursively delete everything within those folders and the folders themselves.

As far as how filename expansion aka globbing works, * means any number of characters, so *.QTFS means any file in $PWD ending with .QTFS and service/* means any file within the $PWD/service folder.

That being said, as long as that's what you wanted to delete, you should be fine.

Use -i or --interactive to force rm to ask for confirmation at every removal, or -I or --interactive=once to ask once if your command would remove four or more files, or would recursively remove files.

Use -f or --force to cause rm to silently ignore non-existent files, and to not prompt for confirmation before removing a read-only file or directory.

You might want to look into trash if you want an undelete command of sorts. It interacts with the trashcan, giving you the option to have a fallback if need be.