Raspberry GPIO once again

I’m new in openHab. I know that openHab is very powerfull but there is one problem. There is difficult to find good tutorials to openHab2.

Could you give me a info what is the easiest way to run simple led blink on raspberry with button in OpenHab2.

I have read a lot of posts about scripts, exec binding and I don’t know where to start.
Thank you in advance.

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