I’m not sure if exactly they are answered there (I have read its very old version before first time installing KiCad in 2017). Your questions simply look very surprisingly. I’m reading forum since 2017 and don’t remember anyone having a problem that GND is GND.
I expect in Getting started there is a simple PCB design from beginning to the end. I thought that after going through such example you should not have a problem with simply using GND and not trying to replace it with the other name.
I have multiple grounds that I’m trying to keep separate and will later tie them together in a star configuration.
The old way (and the only I’m using) is to define several GND symbols but not its name is important but invisible name of pin inside it and then use them as needed.
The new way (since V8 I think) is to put GND symbol and rename it (it didn’t worked previously as it stayed be connected by its invisible pin name to the old net and not by new name).
And then use net-ties to connect your grounds at the point you want.
After reading articles I have linked here:
I rather don’t use star configuration but continuous GND plane like here:
The new way (since V8 I think) is to put GND symbol and rename it
Yep in newer versions one can simply place a power symbol and edit the symbol text to change the net it connects to. This matches the behavior of EasyEDA (and Altium as well, I believe) and I’ve been using it for a long time. Not sure about GND symbols but definitely working for supply symbols. This is probably what the OP trying to do.
Didn’t checked it, but there is only graphic difference between GND symbols and power symbols.
The GND symbol is just another power symbol, nothing special about it.