Make a 4x5 obsidian frame, and set the middle of it on fire.
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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.
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.
You cant go to Olympus but you can go to the nether.
A portal to the Nether requires ten Obsidian blocks (eco version) or fourteen Obsidian blocks for the full version.