Don't try to convince him to invest in Bitcoin that you don't understand, if he only thinks about making a profit on Bitcoin. I think it's better if you tell all the possible bad reasons that could happen in this crypto world if he invests, at least he has to first understand the basics of both technical and fundamental analysis.

If he can't accept that, you should advise him to invest in what he believes in and not be the friend who advises or makes decisions for you. No matter how good a friend is, it could become hostility, it's only a matter of money! because if he loses, he'll be mad at you.