Mine underground at Y levels around 16 and below
Look for iron ore blocks in caves, ravines, and exposed stone
Use a stone pickaxe or better to mine iron ore
Smelt iron ore in a furnace to get iron ingots
Search mountain biomes for exposed iron ore on cliffs
Check deep caves and dripstone caves for large iron deposits
Open chests in villages, mineshafts, strongholds, and shipwrecks
Defeat iron golems in some situations to collect iron ingots
Trade with villagers for iron-related items or ingots
Use a Fortune pickaxe to increase ore drops when mining iron ore