In this inscrutable I will show you the basics of redstone and show you how to use it. Redstone is useful for survival (bases, minecart stations, TNT cannons ect.) As long as you know the basics of redstone you can build lots of cool things.
Step 1: Inputs and Outputs
Inputs trigger outputs. For example when you click a button that is next to a door it opens. This is the base of all redstone contraptions. There are many things you can use as inputs (levers, buttons, pressure plates, ect.). There are also many things you can use as outputs (pistons, doors, gates ect.)