The Nether is a scary place, but filled with rare resources. In the Nether there are 3 major strucutres. The nether fortress, Bastion Remnant, and ruined nether portals.
Nether fortresses are large structures with long cooridors. This fortress can have monsters like, Blazes, withered skeletons, normal skeletons, and magma cubes. Nether wartz can be found growing in these fortresses on soul sand by stairs. Throughout these fortresses, they have chest containing gold armor, iron ingots, and diamonds.
Bastion remnant, are considered the most dangerous structures, they contain piglin Brtes which are extremely powerful piglins, with axes. These Basstion remenat contain great loot in the middle of there maze. Which can contain netherite, the rarest ore. Hoglins, piglins, magma cubes, and piglin brutes are found in these bastion remmants.