Redstone does not exist in real life, however it's traits and behavior closely resemble those of electricity being transmitted through wires.
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You mine it from redstone ore.
You have to mine redstone ore.
To make a redstone torch, you must have one redstone dust and one stick. You put the stick on the bottom and the redstone dust above the stick. It's the same recipe as a torch, only with redstone dust instead of coal.
to explode tnt you need to put a redstone current to it, this can be either direct or through redstone wire. to create a redstone signal use either a: lever, redstone torch or a redstone block you can set a line or circuit of redstone up to the tnt as long as you power the line with one of the power sources listed above
you can put a redstone repeater behind any type of piston and when you add a redstone charge it should work