first you will need to got to the nether to collect soul sand. You will have to place 4 soul sand like a letter T. Then you need a few charged creepers to blow up 3 wither skeletons then lace the 3 wither skeleton skulls on top of each soul sand block. Shoot down the wither with a bow or a cross bow wither strong enchantments. When the wither go es to maling mode which is half way, use your netherite sword to kill the wither boss. Once the wither boss dies, he will drop a nether star.
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If you kill the wither, you get it. It has only one recipe, which is the beacon. To craft it, you put 3 obsidian blocks on the bottom, then the nether star in the middle, and glass (not glass pane) on the rest of the spaces. There is also a server called The Herobrine, which the shard is the nether star.
In order to to the nether you need a portal.
Yes. There are minecraft servers that have skyblock with nether enabled that are cracked.
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 is no cordinates to it,but you can find it in the Nether. That's all I know where it is.