[Gimp-user] Copy selection to a new layer

[Johnny Rosenberg <gurus knugum gmail com>]

Hi!
I'm using Gimp 2.10.6 and I wonder how I'm supposed to copy a small
selection of a particular layer in a huge image to a new layer or perhaps
an existing layer. When I hit Ctrl+c, the whole layer is copied to the
clipboard, not just what's in the current selection.
I do my selection with the rectangle selection tool (shortcut R).

How is this supposed to be done?
I searched the web but I didn't find anything that actually worked.