Open a crafting table
Place 8 matching material items around the edges of the crafting grid
Leave the center empty
Use the correct material for the armor type:
Leather for leather armor
Iron ingots for iron armor
Gold ingots for gold armor
Diamonds for diamond armor
Netherite ingots for netherite armor
Craft the helmet with 5 material items
Craft the chestplate with 8 material items
Craft the leggings with 7 material items
Craft the boots with 4 material items
Upgrade diamond armor to netherite armor using a smithing table and a netherite ingot
Equip the armor from your inventory