The skyhold is a generated structure where the Ender portal is hidden. It is similar to strongholds in Minecraft, however it was placed in the sky because the structure can not elegantly fit underground.
How to find
You can find the Skyhold using eye of ender and 64 blocks.
- If you want a lot of bookshelves for your Enchantment table go there and find the Library.
- It is the only place where Cobwebs, Stone bricks, Bookshelves, Portal frames, Doors, Iron doors, Pressure plates and Ladders spawn naturally