Redstone is one of the more advanced concepts in Minecraft. You can obtain redstone dust by mining redstone ore underground. You can spread this dust across the ground as wire, attach it to levers or doors, and craft it into torches and repeaters to build machines.

How do you get Redstone fast?

You'll most often find redstone deep below the surface, in the bottom 16 layers of the map. Normally it spawns in large veins of 4-8 blocks, each of which will drop 4-5 redstone and some experience when you mine it with an iron or better pickaxe.

What does Redstone do to potions?

Brewing redstone with a potion will cause that potion's duration to be extended; whereas brewing glowstone with one will cause it to become stronger (a healing potion will heal more, for example).