How to meet a celebrity and not act like a fool

The steps I read about the title above are very clear and they allow us to know exactly what to do and what not to do in front of a famous person.
In order not to create an embarrassing situation, for example, you should make eye contact, give a friendly smile and introduce yourself in a calm manner. If the person responds to you, then you know you are welcome to start a short conversation but do not ask weird questions.
Remember always that famous people are people like us and then, you do not need to be afraid of them but you must know that they are not always in a good mood.
The text I read explains carefully step by step how we should react in front of a famous face and not act like a fool and also, it gives overall tips and warnings about what to do and what not to do and the highest tip is to treat others how you would like to be treated.