How to disassemble old lamps?

Hi. I would like a lesson on how to disassemble lamps, especially old lamps to reuse them, upcycle them, or add a new shade.

In this particular case, I have a clasp lamp, and the shade broke off. I would like to remove the parts of the shade that remain on the lamp, but I don't see a way. It seems to be firmly attached to the body of the lamp. Can you help me please?