Basic Redstone Clock

Hello this is my first tutorial.
I am going to show you how to build a basic contraction.

1. place 4 piecesof redstone in corners

2 put redstone repeaters outside the box.

3. Then place a redstone torch and then destroy it as in 3 seconds.

4 Then the redstone should light up forever unless you break a redstone piece.

5 then break and put back the a redstone coner as fast as you can then it should start blinking.

6. If need help look at picture and read the instructions carefully!