Answer:
Use me to reward good behavior.
I am the best thing that can happen after a stick hits a ball.
I am a mini solar powered computer
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
So simple, that I can only point. Yet I guide men all over the world.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.