Gold is used when you’re crafting upgrades for your equipment at the Blacksmith. It’s probably the most common currency in Diablo Immortal that you can farm.
Hilts are currencies exclusive to Shadows or Immortals. You can use Hilts at Westmarch, just look for the Hilts trader, and use it to buy crafting materials that are hard to get.
Platinum currency is mostly used in the market to buy items and crafting materials from other players. You can earn Platinum by selling items in the Marketplace or completing dailies.
Crests are currencies used for the Elder Rift event to get more rewards. you can get more crafting materials like Legendary Gems and Runes if you run your Elder Rift event with Legendary Crests or Rare Crests
Essentia is the exclusive currency for the Immortals, which is collected by having players complete the dailies of the Immortals. It’s used to buy keys to open Kion’s Ordeal. It’s important to take note that the Shadows can steal this currency in the Vault, making it harder for the immortals to farm this currency.
Sigil of Dominance
This is a currency awarded for completing immortal dailies. This can help increase the Dominance of the Immortals once Contributed.
These are currencies used with real money to purchase other types of currencies in the game.