Can someone please explain the difference between the below 4 outlet
configurations. I mean what are the dangers/benefits of the different ones?
Considering I have 3 pronged devices like tv's and refrigerators connected
to them.

1. GFI outlet with good ground.
2. GFI outlet no ground connected.
3. 3 Prong outlet with good ground
4. 3 Prong outlet with no ground connected.

Thanks.