It is very much advisable not to be in a rush to invite a friend to what you don't really understand. You needed to spend more years here and in bitcoin and atleast understand how things work yourself before you invite anyone. It won't be a good experience when your close friend lose money because of you.
One should not spread that news about which he does not know well because investment and trading are those activities in which one have to use his money so if without knowledge your friend losses money then there is a straightforward way for him to blame you because he use his money in this situation just because of you. It is clear that if you tell you friend about risk and benefits so he will surely involved in this case but the matter is that you have complete knowledge about it to give him details.