How to build a Nether portal in Minecraft (and link two portals)
Their chests can hold 1 or 2 Obsidian, Flint and Steel and Fire Charges.

A Fire Charge is a small fireball you can throw from a dispenser or use to light fires.
It is made with the Crafting Table from Gunpowder, Blaze Powder and Coal.
Blaze powder, coal or charcoal and gunpowder make three. Used by hand it lights a fire once, like a single-use flint and steel; fired from a Dispenser it flies as a small fireball that ignites what it hits. It also makes large-ball firework stars.
Gunpowder + Blaze Powder + Coal / Charcoal → 3 × Fire Charge
// Slots with several items cycle through every accepted option.
Their chests can hold 1 or 2 Obsidian, Flint and Steel and Fire Charges.
At the Crafting Table: 1 × Gunpowder, 1 × Blaze Powder, 1 × Coal and 1 × Charcoal give 3 × Fire Charge. It can be found as loot in Trial Chambers and Ruined Portal. Bartering: Piglin.
It is a single-use igniter and a dispenser fireball.