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If you have gotten latest updates then the coordinates should be at the top left of the map when you look at it.
I dont know
Because you have a really bad computer and minecraft is using all of the memory.
you must change the setting so you have to press fn with the F1,2,3... for it to work. Now if you press F5 by itself it will show your coordinates.
If your x and z coordinates are both multiples of 16, you are standing on the corner of a chunk.