[Gimp-user] clone & heal

[norman]

I am setting up to try to repair and restore some very old monochrome
images for a relative of mine. I am fairly confident on how to proceed
but, I have one main area of uncertainty, namely when to use the clone
tool and when to use the heal tool. I have Googled until my eyes are
monitor shaped and I am not really any the wiser. So, I would be most
grateful if someone could point me towards some readily understandable
tutorial material, preferably audio/visual, that I can study and
emulate.

Norman