If you have gotten latest updates then the coordinates should be at the top left of the map when you look at it.
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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.
I dont know
Because you have a really bad computer and minecraft is using all of the memory.
Just specific areas in certain world saves. All the worlds are different in Minecraft for each new world except if you have the same seed. You can mark down certain coordinates of like you're house if you ever get lost.
Let minecraft do its auto update or check the minecraft news!