The nether portal should be 5 blocks high, and 4 blocks wide. Building the portal should leave a 3x2 space in the middle. You could also take out the obsidian in the corners. The portal will still work. Then, light the 3x2 space with flint and steel. If the portal goes up in flames, then that means you didn't do it right. If the middle turns purple, then you did it right.
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Build it anywhere, the location doesn't really matter.
In order to to the nether you need a portal.
A Nether portal is an obsidian structure that can transport players to or from the Nether dimension. USB doesn't come into it anywhere. The 'Minecraft USB nether portal' is just a YouTube fake.
There are 2 portals you can craft in Minecraft. The Nether Portal and The End Portal.
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.