Well you need to make something that looks like hole but, underground .
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Build it anywhere, the location doesn't really matter.
There is no way to build an end portal except on creative mode, instead you must find a stronghold which contains a portal using eyes of ender. The portal must be activated with 12 eyes of ender before you can travel to the end.
The Aether is part of a mod for Minecraft; to explore it, you must first install the mod and its prerequisites.Once you have installed the mods, you must build a portal to the Aether. This works the same as a Nether portal, but with different materials. Build a rectangular frame four blocks wide and five blocks tall with glowstone, and pour a bucket of water into the middle of it. This will create an Aether portal, which can transport you to the Aether dimension in a similar manner to the Nether portal.
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
In order to to the nether you need a portal.