So getting back to the OP’s original question…
1. Until you hit submit everything’s still on your computer. Once you hit “send post” it gets sent for moderation.
2.See #1.
3.An IP address is how your internet service provider knows which computer asked for which information, and they can send the response back to the right computer.
4.It’s usually not that hard to figure out after a while 😉
5.THAT you’d have to ask them…