Any one can answer my question?
You should know first if the ICO you are going to join are distributing ERC20 tokens. But not all the ICO's are depending on it and they have their very own wallet address. My friendly tip to you, before investing to an ICO learn to know more on what type of token they are going to distribute and it's not normal that you will invest into them without any enough background on what you are getting through.
Besides people need to know in which of the two ethereums the project is being created, I have seen people making the mistake of giving an ETC address when a ETH address was needed and it seems those people lost their coins forever so we need to be cautious about that.