Mine Ancient Debris in the Nether, usually between Y-level 8 and 22
Use a Diamond or Netherite Pickaxe to mine Ancient Debris
Smelt Ancient Debris in a Furnace, Blast Furnace, or Smoker to get Netherite Scrap
Combine 4 Netherite Scrap with 4 Gold Ingots in a Crafting Table to make 1 Netherite Ingot
Use a Smithing Table to upgrade Diamond gear to Netherite gear
Find Netherite-related loot in Bastion Remnants if available in your world version
Use beds or TNT carefully in the Nether to expose Ancient Debris faster
Bring fire resistance, strong armor, and plenty of blocks when mining in the Nether