Do you know what nether fortresses are? What can they be used for? This post will tell you!
Nether fortresses are randomly generated structures that spawn in the nether. They are made out of nether bircks, and consist of many corridors.
Uses:
Nether fortresses are used for a variety of things, making them very resourceful. You need them to make potions, and to spawn the wither. Most importantly, you need them to craft eyes of ender, making them essential for speedruns. They are the only places that blazes and wither skeletons can spawn. They are also one of the only places you can find nether wart, a material used to make potions, other than bastion remnants. Inside nether fortresses you can also find loot chests.