There should be several parallel dimensions, and every time you set up the portal it will take you to a random one of the 15 parallel dimensions. 5 dimensions for the nether, 5 for the end, and 5 for the overworld. When building the portal in any of these dimensions it will take you to one for that dimension. The portal is a 3x3 square of endstone, with 1 cobble on top, and fire, then you sacrifice a beacon in the fire.
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