To make a portal make a plus sign out of redstone blocks. Place a diamond block or a gold block in the exact middle of the redstone blocks. Next place another of that same block you chose for the middle where you want to be teleported too (You have to place an armor stand on top of the destination block.) You can make another portal using the block you did not choose and just make it the same way but you can only make one of the diamond and gold block portals. Have fun and give some credit to soccer987654. If you feel like there is a problem comment to let me know.