How to delete a “VALUE” in registry?

Say I am doing my own .reg file, I delete a “KEY” by doing this:
—————————————-
REGEDIT4

[-HKEY_CURRENT_USER\Software\Microsoft
\Windows\CurrentVersion\Policies]
—– (IN ONE LINE, OF COURSE) ———-

Run this reg file it will delete the whole key of “Policies”

Can somebody tell me how to delete a single VALUE which is under certain key name?

Is there any difference if the value is String, Binary, or DWORD type?

Or the delete command only depends on the value name?

Thanks for replying.