Can someone give me a little more info about hard links

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I'm little confused about how those hard links exactly work

If I understand if correctly,it creates something like the normal shortcut but not to the file location(in which folder it is)but where it is on the hdd.

1.You have two copies of the file placed on different placed but editing any of those files will save the changes to the file located on the disk,so both files(the normal one and the hard link)will have that change.

2.The file is perfectly usable in both locations and deleting either one of them(the original or the hard link)will not delete the file from the hdd until you delete both the hard link and the original file.

3.Are the original and the hard link different in any way,can you in some way say that one of the is the original and the other one is the hard link.

4.Are the hard links limited only to the partition on which the original file is located.

5.If the above(4.) is true,what will happen if you create a couple of hard links and move one of them to the other partition.What will happen to the other hard links and the original.