If you downloaded a world, you can go into your Mods and Texture packs folder, go up one folder, then go into the saves folder. Then you can just drag the world into there.
Of course you can. Minecraft has a folder with worlds in it in Application Support, so just put the map in.
First you must access .minecraft, a hidden folder in My Documents/Application Data. Go into the saves folder to see all the worlds that are on your computer. Now you copy the worlds you want from your computer, put them on the other computer, and paste them into .minecraft's saves folder.
You can bring a flash drive in, and put .minecraft and minecraft.jar in the school computer and thus run the .jar and play minecraft offline, on any worlds.
Copy the minecraft worlds from the file explorer
you link it to your minecraft account
Minecraft
yes.
No.
No, only if you delete your .minecraft folder, minecraft isn't 'installed' so you can't uninstall it either, just deleting it from your desktop does the trick, all your worlds will be left alone.
Well there is one way to get into good worlds in Minecraft. Type in a seed.
minecraft worlds on PE are finite, and the water beyond that is infinite.
Sambotambo0.0.4